Does this only happen to me? when I want to take the deposit address then a display will appear like in the screenshot
https://imgur.com/Yf2E5arI have to fill in my personal information before making deposits and withdrawals

luckily they only ask for personal information not including selfie
There must be a reason why they ask you to do the KYC level 1 and I think it is not a big deal for you if you want to stay playing in Stake. To be sure, you can ask the live support why they ask you to pass the KYC level 1. My account is still not verified at all and they have not asked me the same as your account so far but I will not worry if they will ask me the same thing in the future.
I've asked but haven't gotten a specific answer which I don't think makes sense, but as you said it's not too difficult to fill in the data like it's only level 1 but I'm sure in the future level 2 is required. I quote messages in live chat:
Me: why do I have to KYC?
Support: That was recently added, and your account was affected by it.
In order to make future deposits or withdrawals, you will have to input the requested details.
Me: I asked on the forum not all accounts experience the same thing, may I know the reason?
Support: Since it was recently added, users that created their account in a certain period, are asked to do so.
That is all the information that we can provide you with for now, regarding that.
So if you experience the same thing, above is the answer.