Amazon Prime Video will soon come with ads, or a $2.99 monthly charge to dodge them

Emby too ;)

Plex is clamping down on uses violating the TOS though. They're banning whole hosting provider IP blocks next month that were popular with people selling access to Plex servers.

I've also seen reports of them banning individual users sharing large libraries with family and friends over residential connections. And then sending notifications to those people that their friend/family member was running a commercial piracy operation.