I think the core challenge is convincing OSS developers to redirect their attention from asking for donations -- which empirically are not sufficient to sustain

I think the core challenge is convincing OSS developers to redirect their attention from asking for donations -- which empirically are not sufficient to sustain OSS developers -- to selling things which larger enterprises can buy. As a (hypothetical) team lead at BigCo, it isn't within my discretion to award $500 to an OSS project, but I can put a $500 training course or software license on my purchasing card on my own authority. As a (no-so-hypothetical) business owner, it is highly unlikely that I'll ever donate $10,000 to a computer programmer, but I can trivially write that check -- and expense it -- for e.g. a support contract for a technology core to my business.