It seems, all popular exchange & trading services are overwhelmed and many of them have disabled new registrations (including Litebit) or verifications. Also, Bitcoin network is slow, lots of uncommitted transactions.

I'm wondering if all of the "crypto gold rush" will blow up not because of cryptocurrency being inferior than fiat but because of worldwide technical difficulties.

Regarding one of the issues in this topic, I kinda agree that in situations when IBAN verification is expected to be required then they should immediately show a large banner about that and not permit to initiate sending money to their account (not sure, how this could be best disabled).
Or maybe it can be simplified by sending the reference code straight in the first payment? But that would be not wise - the same as sending large sum before being verified. Anyway, the information should have been on their site somewhere right close to the bank account settings and in large, visible text, something like:
"Warning - we won't accept deposits from IBAN until it is verified ...."