Not the first time. I thought a Windows 10 update wiped grub, but Microsoft actually deleted my entire Linux partition. Others have experienced the same thing.
Windows is required for a couple of apps I need with no alternatives, but the only way it runs on any of my computers is in a VM.
I just checked and Reddit did the same with my account. I spent hours editing and ultimately deleting my posts and comments, and the Spez Gestapo just undeleted years worth of content. I'm going to go through them again and this time I'll leave the gibberish.