Luftstalag14
Culé de Celestial Empire
It's not a main sponsor and probably only a 3-year contract. Shouldn't have problems to replace them if needed.
3 years at 20m each year is still a lot of commitment though, given the rampant instability in the cryptocurreny industry. The fact that they are little known itself carries quite a bit of risk. Also being Ukrainian, that carries some political risk. We don't know how Ukraine will be like in 3 years.