I'm not holding my breath, hopefully they're not using some trash ID verification service.
The KYC process is handled by Sumsub, a verification platform which is used by plenty of players in the space, as it seems. See below:
Source: Bitrefill, KYC
More Infos here: https://sumsub.com/privacy-notice/
Looks like they are also working with Binance, Bybit & Huobi. Can anyone comment on how reputable/respected the KYC provider is?