Coinbase security enhancement prevents withdrawal for 48 hours
help.coinbase.com
help.coinbase.com
same idea as locking the bank doors and turning off the ATMs when some nation state has a catastrophic bank run.
Whether it's arbitrary or not depends entirely when it was instituted. If it was instituted today (in the wake of all the other withdraw freezes), then I'd agree it's shady, but according to google cache the page existed since at least last friday which sort of works against your theory. Also, as someone who used cryptocurrency exchanges (not coinbase pro), waiting periods for withdrawing to new addresses isn't unusual.
I flagged it because the article title looks like someone’s trying to be sarcastic about it.
Honestly this post feels like it is trying to spread fear on the back of other providers halting withdrawals.
I am well aware of not your keys not your coins. Yes, I am essentially hiring coinbase as a custodian to manage the security for my coins.
Gotta let Coinbase have its time to trade against you and everyone else.
I don't like Coinbase, but it's good that they are disabling SMS auth for this too.