You may have noticed they're really emphasising this point:

> We can be accused of going open source and abandoning the development of Space Engineers. Our answer is definitely NO.

This is because Keen previously abandoned their game Miner Wars 2081 to build Space Engineers, leaving a lot of bad blood with their backers despite handing out free copies of the latter game. And recently Keen launched Medieval Engineers, sparking fears they were going to pull the same move.

Look, this is a radical and bold move, with potentially huge upside if enough people donate their time to making Keen's product better. Modding is the main thing driving Skyrim sales three years later, for instance. But it's leaning heavily on community trust that's already fragile. They'll have to earn their kudos on this move.

Hopefully this will finally lead to a x64 linux server, which could bring MP a big upturn.