If the resort parking lots for resort guests only, then Disney shouldn't have such big restaurants in them, or advertise them to the general public. Otherwise, make Ohana, Chef Mickey's and the others for resort guests only. Or offer to validate parking if you have to park at TTC and monorail or walk to the monorail resorts to use the restaurants, shops or bars.
For the record, I don't doubt that people use the excuse to park at the lots to walk or monorail over the MK, and I agree that it's an abuse of the system. I remember seeing a popular youtuber admitting to doing it a few years ago. (not going to say who) However, there are plenty of us who don't stay at the Poly or Contemporary who do like to eat at Ohana, get drinks at Trader Sam's or the Wave, and visit the resorts. We generally visit resorts on our "day off", so we've never used the excuse to go over to MK. We do spend a lot for those things already, so adding parking fees on top of that may cause us to change our plans. I haven't been in that situation yet, so I'm not sure. We had our Ohana ADR last month and only had to show ID to park (the security guard did not check a list or scan our magic band) and there were plenty of spaces at 7:30 pm. It also wasn't the height of summer, though.
That would definitely make me re-think visiting those resorts.
There are two different possible reasons for the parking thing: 1. a possible safety/security issue or 2. people abusing the system. My impression from the original post was that there was a possible safety/security issue. Having Lyft or Uber and the passengers show ID also doesn't sound like a "abusing the system" thing. It sounds more like a safety/security issue. Like "we want to know everyone who is coming in".
I don't object to added security measures. I do object to having to pay more to park for using a restaurant, shop or bar at those resorts. It may not be an issue to some people, but to me its one more way for Disney to get even more money. To each his/her own. I would feel the same way if they turned all the parking garages in Disney Springs to paying, or paying at other resorts to park to use their restaurants or bars.