There is no way to block 'kids' from investing or even trying to claim free tokens.  'Kids' can also be mentally slow adults.  I see a bunch of people complain about Byteball (and all other projects as well), simply because they have no damn clue as to what they're doing.  They read what they want and ignore everything else.  So, when they can't figure out how they just spent $8, they complain the project is at fault and ignore what the transition bot said.  It's simply amazing how many of those 'kids' have no idea what a change address is or how to move coins but actually have coins to even move (without having lost them).  Almost as amazing is how many of those people have $100 worth of coin and willing to pay an $8 transaction, but complain that they haven't received $1000 worth of free coin.  They just simply have no clue and almost no amount of coaching will every help them or even change their mind that something is good or bad, because they've already made the decision in their head that it can't be their fault for having not followed directions.