Pokemon TCGP if you’re into that sort of thing. It starts with just collecting, but after a while you’ll be able to battle.

Have you tried hiring developers to do the work that you want?

I just cannot understand the entitlement of demanding some open source developer must do particular unpaid work that users are demanding.

With open source, you can fork the project.

It should be okay for an open source maintainer to say “no”.

It is not open source, because it does not meet the definition of open source.

I’ve noticed that some “mobility” startups are using Linux. E.g. companies working on electric or automated vehicles.

Perhaps disconnecting the RF antenna, and replacing it with an appropriate termination?

Yes, but does that still count as “modern”?