Pint
Level 3

Account management

I'm surprised Quickbooks and Intuit don't get sued frequently.

This is such a silly answer.

No, users do not automatically agree to changes in policy.

Laws like the EU GDPR and California's CalOPPA require policy changes be published AND you seek consent.  Simply demanding consent because someone was silly enough to do business with your company is neither legal nor rational.

Where does Quickbooks find the people who respond to the forum?

Don't answer.  It doesn't matter.  Nothing ever changes with Quickbooks because of these forums.  You're big enough you don't have to care about customers.