I don't know if it's that they are showing anti competitive practices, I think it's the fact that they have such an unsurmountable monopoly on the video platform sector, that they can simply do whatever they please, and people have no option but to accept whatever changes they implement, no matter how objectively bad it is.
I don't have huge qualms with the amount of ads, increasing or not. Like you say, they need to make money somehow, so I understand that. But it's the things like what I mentioned a few pages ago, of them removing the ability to order results by upload date. A perfectly good, working feature, taken away for no reason. Forcing the irrelevant algorithm results down your throat. Forcing shorts down your throat.
You have no idea what changes they will decide to make tomorrow, but you will simply have to accept it, with no say in the matter. If there was a viable competition, they would at least be forced to think twice about their decision, lest people jump ship. But they don't have competition, and honestly at this point, probably won't ever have any.
It's kind of like how Microsoft has (or had) a stangehold on the OS sector in the 90s and 2000s. If you wanted to game, or use certain programs, you had no option but to use Windows. Yes, there was Apple and Linux back then still, but the maturity was no way near what it is today. You weren't getting Photoshop on Linux. You're not getting 3DS Max on Linux or Mac OS, so if you're in an industry that requires those, you have no choice but to go Windows, and we all know what a shambles Windows 11 is turning out to be with all their AI garbage being forced down your throat, and having to sign in to use freaking MS Paint.