[airspeedjangle]

It's tedious to accomplish and not common, but it can be done: https://tech.target.com/blog/open-source-fund

[stackedsax]

Agreed. Unfortunately uncommon, but can be done.

There are a few more examples in addition to Target over at https://fossfunders.com. There is a spectrum of approaches, but it's encouraging to see some companies willing to give financial support without necessarily expecting support or services in return.