It's not virtue signaling – it's true regret. I consider my 2 years at FB a mistake. I knew it from the moment I started that I had made an error, and that I needed to do the 2 years and then leave.

What do I really care what strangers on the internet think of me? I'm just being honest.

editing to add I did it for the money. FB was offering more than I was making, and I got tempted. I'll never make a decision driven solely by money again. So, maybe some good came out of it.