Re after two to three weeks, the Sprites will burn up
Can he guarantee they won't take out a satellite in those two or three weeks?
A Cornell University postgrad student is offering enthusiasts the chance to get their own diminutive bit of kit into space, in the form of a miniature satellite. Zac Manchester's Sprite is a solar-powered board "about the size of a couple of postage stamps", which packs a "microcontroller and a radio for communicating with …
I suppose that it's possible, with about the same probability of you throwing a brick up in the air and taking out an airplane. (throwing while standing under a parked plane doesn't count!)
These things will be released at a lower altitude than sats normally orbit (hence why they won't last long)