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Linus Tech Tips uploaded a video showing how to block ads on Youtube. Which was removed by Youtube for community guidelines violations.
(sh.itjust.works)
https://files.catbox.moe/a6111d.png / https://nitter.poast.org/LinusTech/status/1825956050685800834
If you go the video, https://www.youtube.com/watch?v=GsjHMzGl-VY. You will see it's gone. So Youtube being Youtube.
Here's a Odysee mirror of the video, https://odysee.com/@jopec:7/linus-tech-tips-degoogle-your-life-part-2-adfree-youtube:0.
It doesn't have to be for profit, but it does require distribution of content you don't have the rights to redistribute. I think it's also fine to lump in acquiring content that you don't have the rights to (i.e. it doesn't matter which end of the transaction you're part of).
Blocking ads is merely a TOS violation, and it only applies if you actually agree to the TOS. If you don't consent to the TOS and the platform doesn't make any attempt to prevent you from using the service, then I think you have an argument that the TOS doesn't apply. I use YouTube w/o a YouTube account, so I don't consent to their TOS, but they still happily serve up content. So in my understanding, I'm not even violating any TOS because I haven't agreed to any, I'm just using their website with an add-on that blocks certain URLs. If YouTube decides to prevent me from accessing their content w/o agreeing to their TOS, then I'll probably stop watching YouTube, or maybe I'll decide to accept their TOS, idk, because it hasn't happened yet.
That said, I do feel bad for creators not making money from me blocking YouTube's ads, so I tend to donate or buy merch on occasion, and that eases my conscience. Regardless, I'm quite sure that if YouTube tried to argue that blacking ads was somehow a copyright violation, that they'd lose.