There are ways to distribute a closed source that's pseudo community reviewed: get a few key community members to sign a NDA, deliver them the code, reproducibly build the software and have every member sign the hash. This scenario is suboptimal on both ends though. Users don't want sign a NDA and the business doesn't want to expose the source to that many individuals, NDA or not.

Bitcoin is an open source market. You have no business developing core functionalities like wallets if you're not prepared to reveal the source and be scrutinized. Closed source and DRMs are old models, mostly created and maintained by the entertainment industry (for poor results). Trying to force that on the Bitcoin market is just a recipe for failure. The revenue model should adapt to the environment, the opposite approach is silly at best.

I'm no business man. I think the crowd funding model is a reasonable way forward for any long term FOSS project, but I can't fathom what a sustained revenue model would be like. I do think we do not yet have enough applications on top of Bitcoin to design such model. It's very possible some top layer app will "rule them all" and bring closure to the business cycle. Maybe Armory coupled with a hardware signer and a high level of customization could become the stack of choice to run Lightning payment channels in the future. Maybe the future of streaming will be proof of payments on some sidechain and decentralized distribution on top of namecoin. Time will tell.

One thing is certain, Bitcoin's business cycle is very long, and some people jumping into this market are too quick to dismiss this parameter.