Honestly there's so much good stuff on entirely free streaming platforms like Pluto TV and Tubi that I really don't see any reason to sub to any paid ones. Only paid one I have a subscription to is Peacock but even then the subscription is free and included with my cable and internet plan (I have Comcast and Peacock is owned by Comcast).
I mean I have thought about subbing to RetroCrush but that's mostly because I wanna support that service. Most of the series, movies, and OVAs on the platform can be watched for free, but like they do have some premium-only stuff and like 'streaming service focused on classic anime*', that's cool and what I'm into, I might toss a sub to them to support that to help keep 'em going, y'know?
*Also The Adventures of Sonic the Hedgehog, that most famous and classic 90s anime.