Has anyone gotten sued over hacking AD onto ports? No.
DRM is the last thing i expect because there is no harm to expect for either Jolla or Myriad.
It's not like they are sitting on huge sinecure they have to defend like when the Music and Movie Industry started to fight windmills with DRM 20 years ago.
And for the future, the port is limited to one phone that fades out as we heard.

They should bring a system in place that makes it easy to pay, supporters will do.
And no one is hurt if someone who would not install if he had to pay, does because he has the means to do so out of curiousity.
Any reach is good for jolla.

No idea what they will actually do though.