[randunel]

Since selling PII is a common practice in the US industry, I believe the onus is reversed, they need to prove that they delete/keep-private.

[matt_kantor]

Given how YouTube makes money from advertising, I suspect it's more profitable for them to keep the data to themselves and use it for targeting. I would not be surprised if they also share it with Adsense & other Alphabet entities (and presumably with government agencies), but am doubtful beyond that.

Not that this is much better than directly selling to third parties.

[moffkalast]

Yep, that's my reasoning too.