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Re:Robinhood is limiting purchases of stocks: AMC, Blackberr... by ceejayoz on Thursday January 28, 2021 @10:39AM (#25943494)
Crypto exchanges going down during times of high volume is definitely a thing, yes. For example:

https://www.coindesk.com/coinbase-redoing-infrastructure-to-...

> During the recent bitcoin bull run, Coinbase has struggled to keep itself up during stretches of heavy volume, leading to snarky comments on Twitter and Reddit that it’s only news when the exchange doesn’t go down during peak periods. Given the exchange has filed preliminary documents for a public listing of the company’s shares, fixing its infrastructure has undoubtedly taken on an even greater urgency.

Re:Robinhood is limiting purchases of stocks: AMC, Blackberr... by agumonkey on Thursday January 28, 2021 @11:05AM (#25943995)
Going down is one degree lower than officially displaying a 'you cannot buy <security>' on your app. I know DDoS smell bad but it's not the same. And mind you I lost profits on the latest DDoS.
Re:Robinhood is limiting purchases of stocks: AMC, Blackberr... by ceejayoz on Thursday January 28, 2021 @11:07AM (#25944027)
Coinbase suspended XRP. Not a perfect comparison, but perhaps closer to what you're referring to.
Re:Robinhood is limiting purchases of stocks: AMC, Blackberr... by agumonkey on Thursday January 28, 2021 @11:12AM (#25944116)
It was due to the SEC, not unofficial influences.. I think it's a different topic