It looks super fishy: Needed password reset (so they don't have the password hashes), high fees (0.25% withdrawel fee), and you need to upload your whole life in documents (ID, utility bill, tax report etc.)
And it would make sense that if they cut off the system/backend that were using before, they would need something like the password reset.
Previously auth might even have been handled by ftx main service.
I became really suspicious when they asked for a proof of funds (I've never seen that) and when they wanted a tax identification/tax statement – that's really nothing they should ever ask for, and nobody asked for that before.
Also why 0.25% withdrawel fees?