See: https://www.youtube.com/watch?v=dhbQDzxNzRE
Edit: Adding (thought this data is dated, the number of channels on Plex still far outnumbers what is on Tablo 4th gen, but note, as a broadcaster, that is Scripps, the owner of Tablo now, they can record some streaming content). 4th Gen Streaming Channels vs. Plex Streaming Channels