I'd allow for one exception, which is corporate AI working on data generated by that corporation, not from users of their "platform".
In the industrial world, there's actually decent ways to work even with (corporate) customer data. Some turbine manufacturers offer realtime monitoring of their turbines, but the customer is owning the data. Manufacturer sees how their designs perform in RL, customer gets info on how their use pattern affects maintenance, but that's about it.
That's fine, too -- but I still find it interesting to know that there *are* arrangements where a company processes user data, without claiming ownership and shady bullshit we're used to seeing, and it's even mutually beneficial -- Just not between companies and individuals.
The same thing in private customer land is Tesla taking ownership of customer data, and Volkswagen claiming all data hoovered from electric cars which they sell was rightfully theirs, not their customers'.
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