I don't know how many indie games have gone down the sponsorship route - I remember playing a Czech Dynablasters clone that was sponsored by a beer company, which was a bit weird (but a good game! :-D) - but anyway, I've gone down the route with two of my titles (both still in production). It's not exactly going to let me leave my job to work full-time on games - which would be ideal of course, but hardly likely.
Anyway, it seems to me that indie games and cryptocurrencies have quite a bit in common, so it's appropriate that they help each other out - with indie devs getting a bit of funding help, and the crypto devs getting wide exposure for their currencies. In terms of online games, which is the main focus of these sponsorship deals (though the deals for my own games prove that the idea can go beyond online gaming), the crypto has value because it can be used as an in-game currency.
Two of the most important cryptos that focus specifically on gaming (perhaps the two most important) are HYPER and GoldPieces. The former sponsors Troll Song, the latter Captain Disaster in Death Has a Million Stomping Boots. Hopefully these partnerships will prove beneficial for both parties... we shall see.