Seems to me an overreaction to complain about a single checkbox suggesting that people who make YouTube videos make actual money from sponsorships where ads get them jack shit. They added Sponsorblock but just have a one-time warning, is that really big of a deal? It’s informational, and if you don’t like it, ignore it and move on with your day.
If they were more insistent like a popup every time you used it I could see getting upset about it.