Non-commercial is not open-source, because if the original copyright holder stops maintaining it, nobody else can continue (or has to work like a slave for free). Open-source is about what happens if the original author stops working on it. Open-source gives everyone the license to continue developing it, which obviously means also the ability to get paid. Don't call it open-source if this aspect is missing.
Only the FLUX.1 [schnell] is open-source (Apache2), FLUX.1 [dev] is non-commercial.
Only the FLUX.1 [schnell] is open-source (Apache2), FLUX.1 [dev] is non-commercial.