Somebody sort of casually pirated a copy of IDA Pro back in the mid-2000s (IIRC, he shared his copy on a public server). The IDA people (DataRescue, at the time, but from what I recall the page survived the move to Hex-Rays) found out, banned him from using IDA, and then put a page on their website threatening to rescind IDA licenses from any company that employed him. The IDA team is pretty aggro.