“Illegal” in the sens that pieces are connected in ways not intended by the designers. An eqample here is the blac brick in th, middle of the engine with studs on either side. The black 1x2 plates with cheese slopes are not completely connected to it, so I would classify it as an illegal technique, since it would not be used in a lego set. Too fragile.
Here is a little infographic with examples I found:
It’s better on the issue of tracking, but if one is just an opponent of ads in general, there is no difference.
I would rather pay someone than watch ads (which I do if I watch their content regularly). I subscribe to Nebula, where a lot of the creators I watch post their videos. I also support some through Patreon. I wish there was a way to pay for just a single video, since some creators only occasionally produce videos I want to watch.
Ads promote overconsumption, and I don’t think anyone should be forced to see them, unless they want to. Also, the sponsors are always the same 10 shitty companies (Betterhelp, Raid Shadow Legends, NordVPN…). I don’t care for these companies, so why should I be forced to watch ads for them?