I think the joke was that it's kind of the same with Pokemon GO. You play the game mainly because it's fun or lets you get some exercise in, so it's not really a bad thing that the company used the data to train a useful model. You're still having fun or doing exercise regardless of what they do with the data. Essentially, it's a positive externality: https://www.economicshelp.org/micro-economic-essays/marketfa...
But I think your point, if I understand it correctly, is that the in-game rewards kind of "hacked your brain" to do it, which is the part you're objecting to?
Technically, it's not an externality, because the company that benefits is clearly part of the transaction.
Nitpicking aside, I agree with you.
I think that's part of it- but another part is a lot of people do not like what Gen AI is doing and are offended that what was a fun game is now part of that project.
Like when captchas were for making old books readable it felt a lot more friendly than now where its all driverless car nonsense