There was also a ton of fraud (some estimates were 1/3 of the money went to scammers and foreign people). They didn't have a good way to check if a business was an actual business or not. This resulted in entire neighborhoods of people getting 10K each by sharing the scam [2].
[1] https://www.bloomberg.com/news/features/2020-12-24/small-bus...
[2] https://www.bloomberg.com/news/features/2020-10-29/small-bus...