If I were trying to do that in private, I would stop after two minutes.
But the mere threat of someone watching me forced me to take it seriously even though I knew nobody would.
It was so effective that I would default to Spanish for the rest of the day, or I'd listen to Spanish and then realize how I could have communicated certain things better instead of just passively ingest it.
Though the same reason it was so effective also created a mental toll that I started avoiding by not doing it at all. Need to start it back up.
That said, I reckon the vast majority of streamers are gamers who do want viewership and aren't using it as some productivity hack.
There is this programmer and he is just chilling, programming and listening to music. Just 2-3 viewers. On occasion I say hi, make a chitchat. It’s harmless and a bit of fun/socializing.
I think most streamers know what they are doing.