It does exactly what the name says: stake, spin, see what lands. A couple of spins for fun, sure, but building a collection this way is not something we'd do.
Gift Roulette is a bare-bones Telegram wheel: you stake Stars, spin and find out what lands. No levels, no quests, and a spin takes a few seconds. You'll get it from the very first screen.
New collections land on the wheel regularly: Snoop Dogg Swag Bag, Instant Ramen, Jester Hat and, in October, REDO. Gifts come in batches and in limited numbers. There were only 15 pairs of Durov's Glasses, for example, so the rare items really are rare.
You pick the stake yourself. At one point spins were offered at 25 Stars for a new gift worth 50. The developers say it plainly: the higher the stake, the better your odds at an expensive gift. Even a big stake promises nothing, though. Outcomes are random, and a run of spins can easily leave you with fewer Stars and nothing new in your profile.
Hunting for one specific gift on a wheel makes little sense when you can just buy it. We see the roulette as entertainment with a price tag: a spin or two to try it is fine, one more to win it back is where it goes wrong. Set your Stars budget before the first spin.
Tap a star — you can change your vote later.