I got both an Epic Store key and a Steam key from the development team. I don't know about the Linux support, I never cared and never will, in spite of having used various Linux distributions in one form or another for probably longer than the Valve apologist minority who use one exclusively know what computers are (what a sad 💪 that is, ultimately, but I deem it necessary to underscore my position here), but whoever claimed that Mobius Digital didn't give out both to backers is demonstrably wrong.
That said, I find it really hard to blame small teams or even medium sized studios when they take up Epic's offer for a limited time exclusivity when Epic buys more copies than they'd sell on Steam by even the most optimistic projections. Phoenix Point in particular, when you look at the state the game was in when it released, proved that it probably was the correct decision from a management and economic point of view. Especially for Outer Wilds and Phoenix Point whose campaigns ran on Fig, which meant they didn't just have backers, but actual investors wanting some return on their investment. Getting a fixed sale of at least a hundred thousand copies (which is I think the number that was given, at least for Phoenix Point) solved all these problems and provided a financial boost that kept people employed.
It also most likely cost Epic more than they gained from it. As an avid gamer that annoyed me too, but while I'm sure it wasn't an easy decision, I ultimately understand it. Fun thought experiment, if you'd offer Feargus to buy 500k copies of Deadfire for limited exclusivity on Epic, with the knowledge that the game would ultimately prove to be a disaster in terms of sales (if perhaps not directly in terms of finances with the money of the backers and investors, at the very least with long term issues attracting more investors for future projects), do you think he'd refuse it or take it?
I mean, not that Obsidian didn't answer the question by making Outer Worlds time limited exclusive on Epic before being bought out by Microsoft. Just as food for thought.
We also should not forget that ultimately, everything that weakens the Steam behemoth is good for the market (oi, now I'm poking a hornet's nest, I wonder if the fanboys will come swarming and drone something about their favorite quasi-monopoly being great while arguing for the wonders of the invisible hand of the free market in the Off-Topic political thread). Except for a minority of Linux gamers that seem disproportionally present in crowd funding campaigns, because there must be some reason beyond Unity supporting multiple platforms to always promise Linux support in one form or the other.
I'll see, eventually. Part of the reason I didn't try it right after I got my key was that my controller was broken, and the game supposedly is borderline impossible to play without one, and after I got my replacement I already started playing something else. Combine that with a general sense of not really going to like the premise or the gameplay loop...
Leaves the reason why I backed the game in the first place, and that was beause I didn't want Fig's first campaign to fail, and the fact that it looked like it would until the very last second makes me think that one of the owners chipped in with a last minute investment pledge, because that campaign missed like 10k dollars shortly before it ended until it didn't any more. Which seems like a silly reason, but I figured that could turn into an interesting platform, and since at the time I was backing several games, potentially making my pledge back in sales seemed like a nice idea. Except when Fig started to allow international investments, the idea was as good as dead, or at least I had lost all interest.