Watched a bunch of streams and it looks like they've gone with game journalist difficulty on this one(at least for the strategic layer). Like, kill 5 tanks and get enough money to last a month or kill one tank and one medium mech to last 3 month etc. You can do multiple missions per month ofc, and ammo refills & armor reparis are free and instant. So you pretty much can't run out of money hence can't lose the game.
And the game will have only one difficulty level too, because the devs haven't had the time.
The lack of difficulty levels is something I was surprised and disappointed by since they first announced it. Mitch's "we don't have time to balance for more than one difficulty level" is strange given they could even have put in a basic '+10%costs -10% revs' difficulty slider on the economic sim and called it expert or something. They'll obviously balance it so that new players don't ragequit and hence decent players will soon be rolling in cash. But some of the devs have already been talking about an ironman mode and more challenging difficulty levels so I'm optimistic that's something that'll come along after release. And given what's exposed in the JSONs it'll be easy for people to make mods that adjust the economic sim. In the beta someone even made a mod that improved the AI significantly so given time I think the game will definitely be made more challenging.
Another thing that's a bit strange is that if you salvage 3 pieces of a mech chassis and your tech puts it together, it comes with full, operational stock weapon loadout even if you didn't have those weapons to install on it. On the other hand some people are bitching that when you sell parts in the store you only get 10% of the purchase price. So they've obviously decided to make salvage something that is cool to use to build up your unit rather than something to grind to buy the best stuff. I would still hope that a more challenging game mode would have salvage chassis parts producing a mech with no weapons that you'd have to kit out with what you can scrape together, just seems to fit the idea of a scrappy little merc company a bit better.