Oh trust me I can conceive many ethical ways businesses could operate without ads. I think what you mean is that you shouldn’t use a service you know is unethical. But there are problems with that as a general rule.
First being that there’s no ethical consumption under capitalism so that makes things difficult.
Second, “voting with your wallet” is pointless, you’re much better off voting with your votes and ad blockers if you want to see real change. If anything by your logic buying YouTube Premium is worse ethically since you’re directly supporting a company that makes money on unethical ads. Giving them more money won’t make ads go away.
And to that, third, demanding self-flagellation to prove that one is sincere in their beliefs is puritanical nonsense. You are absolutely allowed to both buy Nike shoes and fight for legislation that forbids them from treating their factory workers poorly.