(Quiet founder here) We already support Tor financially and will probably also run relays someday!
Quiet is a founding member of Tor's Onion Services Resource Coalition, which started in response to last year's DDoS against the Tor network, which affected onion service connection times. Alongside a small circle of other affected products we helped Tor raise enough to hire ~2 full-time engineers to work on onion service reliability, which had been a bit underfunded because onion services only represent a small share of Tor's existing usage.