I had find something that will be helpful as I was also seeing this accessibility setting after new update.
So here that might help
Okay, so imagine you have a game you like to play on your phone or tablet. Sometimes when you open the game, there's a little video that plays before you can start playing. This video is called an ad. Sometimes, you can skip the ad after a few seconds, but sometimes you have to click a certain spot on the screen to make it go away.
The service that the statement is talking about doesn't know how to do that clicking on certain spot on the screen, so some ads that need that clicking won't work. It's like if you had a toy that only knows how to do certain things, but not everything.