The question is, did they notify the user that the account was blocked, or was it done silently? My money is on the latter, obviously I don’t know, just my guess. Was there a reason? Blocked is semantically harsher, than it has been disabled.

It was done silently. I am one of the affected developers and my software is the open source file system driver WinFsp:

https://github.com/winfsp/winfsp

Uncool. Now the question is, how many people, many not reading hn, are actually affected. Seems like a blanket ban of some sort.