They have not asked for KYC yet however this account is old. As far as I know the old accounts did not require KYC.
Where have you been?
They already ask old-user for KYC. It's on the (Email) for people who are not KYC yets required to KYC before Jan-2025 (otherwise, you can use Stake anymore). They even give some offers for old-account based on the rank (250$ for Verify Level 2). It's the highest we know.
I'm one of user old account, who are finishing my (KYC) on October with promotion 250$. Some user discussion, they offering again (for extended) with the rewards 250$.
This KYC policy should be for all Stake users. don't know if affiliate accounts will be required too or not (it should still be required). might have to check email first, if they got the KYC promotional email too or not.
And to be sure, contacting support is also possible. that would be better.