Games for the less fortunate.

Why not? Exploitative users'll be rushing to bring in their alt accounts for requesting free games.
I mean, in addition to just getting even more games to waste on card-farming, they can either flip a high value game and lose the account (no real loss), or get a game they legitimately want to play on their main account (making the ≤ 30 requirement meaningless to such individuals). There's no risk to them for participating in something like this (and if they've got alt accounts on SG in the first place, then clearly they're fine with breaking rules for personal gain).

As Mully said, checking achievements to try and determine actual play is a good way of determining if an account is legitimate. You can fake achievements, but presumably the added effort will at least dissuade some users.

I am sure most people will appreciate the sentiment of what you're trying to do. Best of luck to you either way!

Stevey posted exactly what I wanted to post after reading your OP.
They do accept "guest gifters" in that group, and they do all the checking and monitoring for you.