"Canonical profited obscenely"
I have to challenge that. Their last revenue numbers that I can find (2020) indicate a moderate profit on a headcount of about 500 people.
They've grown pretty well, but that's not the same as profited. Canonical targeted the gaps that Red Hat left when it moved from Red Hat Linux -> Fedora / RHEL, and ate up a lot of the Linux market and grew the pie a bit in terms of people using Linux.
But Canonical has never been making money hand over fist. Their finances aren't public but AFAIK they've largely been in the red or breaking even. Their 2020 financial statement indicated profit for 2020 but loss in 2019.
An interview with TechCrunch last year[1] suggested their revenue was "$175m last year" -- that's a small fraction of Red Hat's revenue and less than SUSE if I'm not mistaken.
Note I'm only responding to their push for Ubuntu Pro - if they're also not pushing patches back upstream or playing games like that, that's a different story. But that's not about making them available vs. making them convenient.
[1] https://techcrunch.com/2022/04/21/canonical-now-hopes-to-ipo...