I HAVE full paid version of QB21 pro on my computer with a QBB file of an old project I need to pull a report from. QB always touts you own your data.

They introduced QB Desktop 2021 Pro Plus at that time and also offered QB Desktop 2021 Pro with non subscription licenses. They offered QB Desktop 2021 Pro Plus at a lower price but many buyers didn't seem to realize that they were buying a subscription license.

The trial version is yet another download and only good for 30 days I think it is. What do I do when I need something later?

Have you contacted Fiat Lux? As I said, you can use the trial version to access your historical data for good if required.

QB has violated the publicized user agreement.

We did not find any violations in their EULA. Unless you can help us point out specific clauses.