IIRC I had one such on Instagram asking about 'my pictures', as in your case no specific requests.
I discussed it with the curator of the exhibition I display with and she suggested I just treat it like any other sales opportunity. So, I wrote back saying thanks for the interest but all my images are sold as physical prints and I would not be sold as NFTs. Please tell which print you wish to buy and where in the UK are you ?
None too surprisingly I had no reply!
Edit ~ as for the scam.......scammers aim to attract the naive, gullible, greedy, vain et al. They are groomers of those that answer affirmatively and no idea of the way a scam would develop but sure as eggs is eggs.....they either want your money or your identity!