Sure, I'll import my key to another wallet and sweep my funds.

I wonder if you will say the same when the domain / server mutinywallet.com get busted or as happened before, devs will decide to censor your use of that wallet.

anon

I hold the keys. No one else holds the keys.

bitcoin

Migrated my WoS balance to Mutiny

If you do not run your own Mutiny node and wallet backend then you just migrate from one custodial domain to another... (aka app.mutinywallet.com).

So I do not see where is that "self-custody" experience.