As to whether the new service is covered (at least partly) by dues the answer is possibly yes but such would not raise the dues you were paying before the service was created. You need to understand where the money comes from for centralized MS services and the reservation website systems.
DVCM, the management company for each resort, is responsible for providing all the services needed at each particular DVC resort for operations and maintenance and charges dues for the employee costs and services provided at each resort. (The employees at the WDW resorts are actually employed by the central Disney entity in control of WDW -- DVCM pays that entity the percentage of the overall employee costs deemed applicable to DVC resorts.) DVCM charges for all those on-site services and employee costs via particular items in the dues. DVCM is also responsible for providing centralized MS services, including computer systems, as such relate to home resort reservations and other centralized services (e.g., phone, email, chat) provided to members, other than any such services or systems that relate to members trading out to non-home DVC resorts, or other trade-outs such as to non-DVC Disney resorts, Adventures, or through II.
BVTC is the company responsible for all trade-out activity, including members/owners of one resort reserving a non-owned DVC resort at 7-months out, and other trades such as to non-DVC Disney resorts, Adventures, and II.
Though DVCM and BVTC are separate legal entities, the centralized MS and computer and phone system services for home resorts and trade-outs are generally handled by the same group of systems and personnel, i.e., it is mainly just an accounting difference.
The money to pay for those centralized MS services and reservation systems, comes from the following sources:
The annual dues provide for a management fee payable to DVCM, which equals 12% of the total of other operations and capital improvement dues in the annual budget (excluding a couple of items such as the management fee itself). BVTC also has a specific item in the dues payable to it called the DVC Reservation Component, which is the portion of the central MS reservation services and systems deemed applicable to members' reserving non-owned DVC resorts, for which the dues charged equals $1 per member per year (counting husband and wife as two, and, if you own more than one resort, you get counted at both).
Next, there is the division of breakage income, money gained from rental of DVC rooms to the public still open at 60-days out from date of arrival (although DVCM can act to have such reservations made earlier than that based on estimated likely openings at a resort at 60-days out). Members dues are reduced somewhat by that income because the first layer of such income from those rentals is used to set off 2.5% of the annual operations and capital improvement dues for the resort (less some items). The income above that next goes to BVTC to cover all of its annual costs plus 5% of those costs (a built-in profit). All breakage income above those two items then goes to DVCM to use as it desires, including keeping it as profit or, if needed, paying for some of the central member services and reservation systems costs. I was informed a number of years ago, and I assume it is still true, that the annual breakage income for all DVC resorts combined has traditionally exceeded both the amount used to set-off dues and to cover BVTC's costs. BVTC also gets income it can keep from fees charged for trade-outs.
One may notice from the above "dues" items that the amounts members pay for the centralized MS and computer reservation services do not depend on their actual costs. The 12% management fee is always 12%. The total amount of that fee can increase as a result of the increase of all those other dues items not related to centralized MS and reservation systems, but not the percentage. The $1 per member DVC Reservation Component fee is always $1. Breakage income is income not costs and the first layer always goes to offset dues. In other words, DVCM and BVTC could jointly spend, annually, $500,000 on all those centralized costs or $20 million, and your dues would not change based on the amount spent. (DVD also contributes for some centralized services such as things having to do with sales of DVC interests, promotions for member sales, and member benefits.)
One may also notice that, though the DVC entities legally need to provide reasonably adequate centralized MS services and computer reservation systems, the law does not require perfection, and the DVC entities have an incentive to keep the costs for such services as reasonably low as possible so they can realize a higher annual profit from the income items used to pay for such services.
