I have a PRO account ( MOBILE ONLY) . Can I create private lobby with my friends ( they don’t have PRO and some of them don’t even have an account)?

My questions are :

1) can they join my private lobby and play unlimited times even if they don’t have an account or a pro membership?

2) can they join My private match through a link without installing the app? what I mean is that If I have a PRO MEMBERSHIP only for APP, do my friend need an APP too to join?

or can they join even without the app ?

3) what’s the advantage of having a PRO account also for desktop in terms of private lobbies if any?

thank you guys for helping me