I feel like Github and co could do a LOT more to help open source project maintainers and contributors rewarded.

They can offer a new subscription model for people with expendable income and companies with benefits, on a per user basis instead of a per project one.

They can offer monetizing issues, e.g. promoting a question or issue report with an X amount of currency.

OS maintainers can create a bot that asks people to contribute financially or to reach out to their employer to do so.

Github can push their sponsors program more, and aim it at companies / "enterprise" sponsors.