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There are some old loyal members who don't want KYC rules for bunos claims and they will switch to another casino if the bunos claim requires completing the KYC stages, so the perception of KYC is very sensitive for some members for privacy reasons but they might only complete level 1 KYC if The casino does not ask for proof of ID or other documents to be uploaded
If the users are not claiming the bonus then there is nothing to worry, most of the time they wanted to make sure that the giveaways are not abused by multiple accounts and there are not much trusted casinos in this space to switch them every week as majority of the regulated ones will be asking to verify yourself before playing especially the fiat ones.
Yes, it doesn't matter if the user doesn't want to claim the bonus, just verify level 1 to be able to bet on Stake.
I agree that maybe Stake has regulations requiring KYC level 2 to be able to take the bonus, because Stake is one of the largest gambling sites and has very many customers and possibly has level 2 verification regulations to avoid bonus abuse.
We all know that bonus abuse is common in gambling and it's only natural that Stake has those rules.
Because Stake also provides a very large total bonus and wants the bonus to be taken by the right customer to get the bonus.
If there is no level 2 rule, the customer who is supposed to get the bonus may not be able to take it because the bonus allocation has been used up by another user who abused it.