Does that give you access to all the features, or do you still need to pay?
Do you get TOTP support and Organizations on your custom server for free?
EDIT: I just tried it, and yes, you do get (at least) TOTP support for free. Haven't tried orgs, but I'm going to convert it for Dokku now and host it somewhere as a backup plan.
I don't think this is the case. There's really no way to use the license with a custom server anyway.