Per [0], a possible answer to this seems to be that an arms dealer had connections to a company called Tardigrade Ltd. and all transactions with firms like these are prohibited which is why the word "Tardigrade" made it into PayPal's filter.
As long as companies like PayPal have issues like that, or with moderation in case of Youtube, Twitter or Facebook, I'd claim neither of these companies have actually solved scale. If they can not properly deal with the issues that arise of scale, they haven't solved it at all. They might be reaping the benefits and dumping the issues on others but they haven't solved anything else at all.
As long as companies like PayPal have issues like that, or with moderation in case of Youtube, Twitter or Facebook, I'd claim neither of these companies have actually solved scale. If they can not properly deal with the issues that arise of scale, they haven't solved it at all. They might be reaping the benefits and dumping the issues on others but they haven't solved anything else at all.
[0] https://twitter.com/kenshirriff/status/1304564003859918849
[1] https://home.treasury.gov/news/press-releases/sm849