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I'm pretty sure Facebook is still running it. They've done a migration to 8.0 a couple of years after it came out (it was a massive release).

https://engineering.fb.com/2021/07/22/core-infra/mysql

Obviously lots and lots of companies. Do you think a mature company just migrates to a different database unless it is absolutely necessary? That's a multi year project. I'm at a smaller company (around a 100 devs) and we have easily a dozen different production instances, some small and some larger with many replicas, etc.

New projects get MySQL too because we know it and it works.

> Do you think a mature company just migrates to a different database

You are right if you look at the current state of how MariaDB and MySQL diverged. But if you migrated right at the time of the split or close to, they were not different in a meaningful way.

> unless it is absolutely necessary

Staying free of Oracle is often deemed absolutely necessary.

MySQL performs well at large scale, and has a very cool and weird storage engine option called MyRocks, that slows read performance but allows demented write rates and compression.

But yes, it is very bad.