I have been pretty amazed by Tubi, which has gotten very far with little buzz in the media compared to the struggling subscription streamers.
Tubi has a crazy deep catalog including shows like Ranma 1/2, Accel World, My Cat from Hell, Kitchen Nightmares, and The People's Court.
It's like broadcast and the lower tier of cable TV died and went to heaven. On other FAST services like Pluto and Plex you will also find multiple MTV channels that really play music videos and South American soccer.
I'd imagine it puts some pricing discipline on the subscription streamers.
The current ad load is currently pretty light but they have a good chance to improve on the TV commercial model with personalization. They ask for your email address to save your viewing state across devices and after I did that I began to get what seemed like retargeted ads for brands I had engaged with before. (To be fair, after I bought a big bag of cat litter at PetSmart last month I've heard their jingle almost continuously on YouTube... Anything for you!)