Because people won’t pay for it.

This is an issue I know well. I was on the Windows 3.1 team at Microsoft. I wrote the book No Bugs. I founded and built the software company Windward Studios.
...

ps - I think this meets the subreddit rules. If it does not, apologies and please delete it.

High level summary article

More detailed article

In June, the Python steering council announced that it was pausing work on the JIT in CPython's main branch until there was an accepted Python Enhancement Proposal (PEP) that addressed concerns about maintenance, compatibility, and set clear success metrics as well as a timeline for completion. [....] After months of discussion, the JIT maintainers have withdrawn the PEP. For now, it appears that development on the once-promising project has come to an end