I am very worried not about the fact of submitting passport data to confirm my identity, but, first of all, who will control the safety of the entire database provided by users. Moreover, even in state structures there is a clear list of requirements that have the right to be exposed in front of a person and who is authorized to demand passport information. In any case, all companies that require KYC must be formalized.
As for me, I am a little worried when submitting KYC documents. As much as possible, I would really avoid sending images of my passport or even driver's license. Identity theft is getting common nowadays. Anyone who has access to that personal information could use it for some illegal purpose.
And who will guarantee us that these data on their hands are safe? For all we know, even wallets could be hacked. How much more to personal data which are not as protected as coins?