I don't use them. I do pay for the version without ads of the services I use them most though (YouTube, Nebula, Reddit, using Kagi instead of Google, etc). I happen to not use sites that don't offer a version without ads enough for them to annoy me OR I've used FB and it's so annoying that I just stopped using it, which is an improvement on my life anyway.

All in all i spend about $30/month to not have ads while supporting the sites I use, which I think it's pretty reasonable.