From a bunch of digging it appears that, perhaps, Clint set up/joined some sites that were similar enough to his employers, without telling them, and when they

From a bunch of digging it appears that, perhaps, Clint set up/joined some sites that were similar enough to his employers, without telling them, and when they found out they took that as him trying to siphon users off of their site, and fired him. If this is true, whether that was wrong of Clint to do or not would depend on his contract.