They offer a 2FA Protected Accounts, is like a 2/2 multisig where one key is held by BlockStream...My question is what would happen is BlockStream serves went down or disappear?
I use the wallet, really like it, and waiting to see what their LN is going to be like with Greenlight
as for the the 2FA key, it expires after 1 year by default so that your funds can be spent only with your own key, instead of the usually required two signatures so if BS goes down you should be able to send your funds