Understanding the envelope of releasing software with the Quest2 team (and hi!)

Hi, I'm ET, i'm also from BC. I'm a developer and I just bought the Quest2 and joined the forum.
I'll be honest, I do have mixed feelings about the Quest2 (which I'll happily share with the readers/team). 
I'm currently considering a side project of a UI/UX project (something like "bigscreen").
I'm also hesitant before putting hundreds of hours into a project to learn it isn't the relationship I'm looking for.

I have more than a few questions/assumptions, kindly corroborate or correct:
1.) Is the Quest2 a closed ended ecosystem? Would a user have freedom to download free programs or versions of android operating systems into the Quest2 without being 'tethered' to Facebook?
2.) Apart from the above, as a developer, do I own the software I release to the Quest2 ecosystem? Do I own the software's IP after it's released? I'm not a lawyer, do I need a lawyer to go over the agreement before considering developing software for the Facebook Oculus Quest2? 
3.) Am I obligated to share with Facebook the data I pickup from the users (movement, microphone, gallery, etc.) ?

Thanks!
ET