[dathinab]

they but "minimal dump DRM" into their client (supposedly, from people which leaked the linked source code, no me)

easy to circumvent

but would fall under "circumventing security protections"/"hacking their API"/etc. And due to the sometimes very unreasonable laws the US has in that area they can use that to go after anyone providing a workaround.

Through that maybe won't work well for the EU, I'm not sure how much the laws have been undermined in recent years but we had laws which made it explicitly legal to circumvent DRM iff it's for the sake of producing compatibility (with some caveats).

[pocksuppet]

I think the law just says that it's legal to circumvent DRM for compatibility - they don't define DRM or compatibility. It's one of those vague laws that you only know if it matters when it gets tested in court.