It's peer-to-peer payments and banking, which have been around for much longer than the stocks/bitcoin aspect of the app.

It's already open source, because GPL requires it. It's unlikely to be accepted as an upstream contribution given that Oracle has their own Vector type that is only available in their MySQL cloud service. Don't expect it to show up in a standard Oracle MySQL community release.

Is that the case when they're only providing as a service rather than distributing it? And if it is, where's the code?

Can it be put into MarianDB? Or has the two project diverged so much that is not possible now?

To be honest using MySQL the fact that it is owned by a corp is quite a concern ATM.

Well. Let's see how it turns out. I am hoping Vector Type will be available in community release in later 9.x version.

The mental model that you get critical infra for free is wrong.

It's on the official Vitess roadmap, though you do have to search on this page for it https://vitess.io/docs/resources/roadmap/

Not any more https://github.com/vitessio/vitess/pull/9760#issue-114721804...

There are no plans right now.If the Postgres community (or a Postgres user) would like to take this project up, the best way to proceed would be to do it as a fork of Vitess. Once the implementation has been proven in production, a “merge” project can be planned to bring the fork back into upstream.