How does this compare with matrix?

Phone bridge!? can you elaborate please?

Honestly is not a big deal. Some specific instance might start behaving like aholes because of corporate greed or anything else.

All they can do is take their specific communities down. The affected communities can always move to other instance (that is easier than changing to a different system all together).

Changing platforms will always be harder than just switch instance because you instance changed the rules on you.

I will look into FiveFilters, sounds like it would solve some issues for me. Thx