>This one claims 20m paying subscribers, which is not a lot.

It is for a B2C with $20 as its lowest price point.

>A lot of weekly active users will use it once a week

That's still a lot of usage.

>and a large part of that may be "hate users" who want to see how bad/boring it is, similar to "hatewatching" on YouTube.

And they're doing this every week consistently ? Sorry but that's definitely not a 'large part' of usage.