I don't think suing is something to even consider, just point out the fact that he made his money and disappeared and discourage anyone else from spending anything else on this until he actually starts producing content, and honestly, even if he does release an update, I still wouldn't support the patreon until we start actually getting regular builds, I'd say at this point he's completely ruined any trust or faith most folks can have in the project, at the very least that's the case for me, so until that trust is properly earned back he really shouldn't be given another dollar. regardless, at the end of the day its your guys' time and money, so ultimately just do whatever you want with it, but the above is my opinion amongst many.