In the ham radio world Ham Radio Deluxe (HRD) is probably the most frequently used piece of software. It has a ton of functionality for things like logging contacts and controlling radios. There’s really no single competing software package that does it all the way HRD does. It’s not free or open source and a paid license is required.
But it seems their dominant market position has given them the impression they can do anything they want. Like, for example, invalidate a user’s license for posting a negative review online. The review pointed out issues with Windows 10 and HRD’s unwillingness to fix them. They demanded that the review (which documented the problems the user had and continued to have) be taken down in order to re-enable the license and threw in a lawsuit threat as well.
When he went public with his dealings with HRD, the floodgates opened up. It appears this isn’t the first time HRD has invalidated licenses in revenge for negative reviews. They seem to truly hate their customers but until recently this wasn’t well known, even in the ham radio world. That’s no longer the case.