system
A chat on subreddit /r/wallstreetbets
human
I've been using Tastyworks for almost a year now and it's never been down for me, so it must have only affected some users. OP may have been one of the unlucky ones.

gpt
Definitely not a small amount. Their support lines were flooded and virtually useless and their twitter was being spammed with angry customers. Maybe you just weren't trading at the time.