I would strongly advise against implementing any KYC requirements.
I'd rather have some more restrictions on the free bonuses rather than having to verify.
While I personally do not have any issue with KYC especially under reasonable circumstances, as I’ve stated before, I understand that many really dislikes it. Though in this case, the management is requiring it for bonuses because there have been many instances that some players really abuse it, so I think that it is justifiable to do so. But, let us see how OP would respond to this suggested alternative.
What happens is that there are many users who defend their privacy and anonymity, just the fact of meeting KYC requirements is already somewhat cumbersome, because very few people like to give their data, and false data is not good to give because if it has arrived In case you want to make a large money withdrawal, one more KYC test can be required and if they don't match they can even ban an account, then it is sometimes preferable to have a high wagering on the bonuses than to comply with KYC, at least I see that it's better that way.