I was initially looking at mybb and I saw a thread on their forums about the XenForo lawsuit with vBulletin. My history with Invision/Matt's software goes all the way back to when he worked for Ikonboard. When Matt left Ikonboard back a decade ago and created IPB there were tons of rumors. Eventually Ikonboard vanished. I am sure the other guys suing XenForo know the history and know this software could take their market.
I put some money down on XenForo. Awesome work devs. Keep it up.