Many potential gamers worldwide still use slow or unreliable internet connections. Game developers lack tools to optimize for these conditions.
Build a game networking library that maximizes playability under poor connections. Include techniques like prediction, compression and minimal state sharing.
Sell licenses to game studios or offer a revenue share. Indie developers might pay for specific optimizations.
The MVP could be a simple demo game showing the techniques. Expand into a full SDK later.
Challenge will be balancing modern graphics with low data usage - you can't sacrifice too much visual quality.