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Yep

The Twitter hack was said to have gotten away with roughly $130k, while Coinbase reported to have blocked 1,100 accounts from transferring over $280k

That's something I didn't know!

I do remember they prevented a BTC transfer of mine a couple of years back, delayed it for about a week, so annoying!

I'm not entirely against such companies protecting people, but people do need to be aware of this control so they can use alternatives if they desire - as I understand it there are very few genuinely decentralised exchanges around?

There are "very few genuinely decentralized anything" around us. But we will get there, block by block :)