Indeed, it is ridiculous, like many regulations that reach the point of absurdity. I recently learned about a regulation on a parking lot that can only be understood if the person who made it and the municipal corporation that approved it are morons.
I think this kind of feature is on transak.com, a 3rd party provider that Metamask uses to buy and sell inside of their wallet.
It says it is only for first-timer customers, is this your first time doing the transaction with Transak inside Metamask?
Even if it is only for first-time customers, it is absurd to apply it on amounts as low as 5 pounds.