I'd only mine if there is no other way of acquiring Bitcoin like being unbanked or underage. Or if I got solar panels and free electricity. Otherwise buying is probably more profitable.
Underage does not seem appropriate here. Giving money in the hands of kids is a wrong thing to do but I guess most users are going to be of age in this sector. Kids should focus on building their career and education first to get a stable job.
Solar panels are expensive - the major concern of mining is to reduce the investment so as to maximize the ROI. You are not going to buy something that costs too much reducing the budget allocation to something else. Some miners are using it but they have much bigger farms and the number of ASICs here are making the difference.
Even then, with the huge hashpower struggles between mining pools, indie miners have very little scope to ROI. On the other hand, buying bitcoin is way easier.
Underage can be under 18 years old and we know that many centralized exchanges requires a kyc now. I think that's what he was worrying about but let us not forget that there are dexe's too which doesn't require a kyc and we can safely buy btc's there if we are not in the legal age.
I believe so many underage people are involved in cryptos right now due to the promised profit and also to that play to earn games. If he is unbanked that means he doesn't have any cash with him so how can he be able to mine a btc that way? Unless if he already have a miner with him or he uses someone else miner like his brother, father, friends, and cousins.