Both… I think subscribers are generally happy for what they get, and there a number of interesting providers. I also can read about a few providers not being happy. Are you on there in some capacity?
I can’t see what would possess somebody to subscribe to a mailing list for any reason in 2022. Email is mostly for receiving spam today, I’d much rather read blogs in a basically clean set of RSS feeds rather than getting opted in from several businesses every day, some of which I know, some of which I don’t.
For some reason some people are absolutely enamoured with mailing lists. Maybe it's an (Internet) generation thing, because i also consider RSS to be a much better way to "receive" content, and email is either for spam or serious communication (bills, taxes, etc).
I am not opposed to the idea of an email list except I have to go through a continuous process of unsubscribing myself from email lists and maintaining spam filters just to be able to read email.
Subscribing to any email list deliberately just breaks down the discipline of delisting myself from hpunwanted email lists.