Please advise: I can transfer BTC into Revolut but won’t be able to transfer it back/out to my crypto wallet once it is in Revolut?
You can’t withdraw or fund your Revolut accountwith crypto directly right now. Check out the blog post on Revolut’s website about all things crypo 
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Hi there.
There are no external transfers. At the moment you can buy, sell, transfer within Revolut!
Find more info on our blog: bit.ly/2wUvxvZ