If you want to actually make a difference, offer shell accounts to people you can have a personal* relationship with, e.g. kids for whom the nearest thing to a general purpose computing device they have at their disposal is a Chromebook and who don't otherwise have the resources to pay for hardware (or a VPS account) of their own.
* should help the "even if you find a way to, please don't hack me" requests go further
* should help the "even if you find a way to, please don't hack me" requests go further