@happybeing lots of people hacking on Mastodon! I know of many project forks.
As for nefarious hacking, I doubt Mastodon is a lucrative target. Probably some script kiddies have tried, but I doubt there has been any major efforts by professionals.
This Mastodon instance is for people interested in technology. Discussions aren't limited to technology, because tech folks shouldn't be limited to technology either!