I'm actually going to go a different route here since it appears there's a different scenario the OP is actually talking about.
If you're connected to a hotel's wifi or a ship's wifi you're on the internet practically speaking especially in today's age. But there can be limited functionality able to be used depending on the company. A hotel and a ship's system especially these days operates on the internet but they can limit what functionality you have unless you meet xyz qualifications.
So in this case this would be you'd be able to do mobile check-out for example but not able to serf webpages beyond the company's. A cruise line's app would work to order food but not to use functions outside of that that rely on internet access (or cellar data signal/access).
In this frame of mind you could understand why a company may advertise free wifi and it be accurate.
With the cruise line we do they have complimentary wifi for everyone. The wifi is connecting to the internet regardless it does however block certain features like streaming based on your login information as well as can block apps. On our 2023 cruise Google Chat was blocked but in 2025 after the cruise line switched to Starlink we noticed Google Chat was not blocked. If we are using cellar signal Google Chat was not blocked period. We think the switch to Starlink changed the blocking of Google Chat.
How this particular cruise line advertises this is by saying "Stay in touch with family and friends or take advantage of working remotely while you’re on board. Seabourn includes complimentary Wi‑Fi with unlimited minutes for all bookings so guests can access the internet throughout their voyage from anywhere on the ship."
Surf Wi‑Fi Package
Allows
1 device per guest with unlimited minutes of access for general web browsing, email, and checking or posting to social media accounts.
Stream Wi‑Fi Package
This upgraded package allows
up to either 2 devices or a paid upgrade to 4 devices per guest with unlimited minutes of access to web services offered in the Surf package PLUS access to video streaming, internet telephony as well as VPN/cloud storage services.
Another one is when we flew zip air which offers free wifi but it works for just their mobile site allowing you to order food, watch limited shows/movies, order amenities, check the location of the plane, etc ***special note zip air does not have their own entertainment system so you have to use your own and you use the mobile version (not app) to connect to their system.