Let me add something before you lock this thread as I suggested below.
Yes, it's nothing for you and if you're concerned about your friend it's nothing from him, both of you should have nothing to worry about.

It's as simple as that, it might have a tax obligation related to their purchase, but once your friend transfers the Bitcoin to your wallet, it's your friend's responsibility ends.  However, keep in mind that it will still be aware of any tax implications related to selling or gifting cryptocurrency in their jurisdiction, as mentioned above, each country has its jurisdiction to follow in taxing crypto.

You can execute it on your own, scroll down, and find the "lock topic" button below.