Mono is owned by WineHQ

And there are other tools that use the same database format. I use keepassDX and keepassXC

Catima can also handle pkpass (Apple wallet) files now, although last I checked it chokes on “pkpasses”, the zipped collective version

In essence keepass is an open database format and a bunch of different software tools have been written to interact with it. You can quite happily share the same keepass database between different software, e.g. synced between desktop and mobile

You don’t happen to know what whereabouts in legislation that’s detailed, do you?