Last I checked with Tidelift, they target primarily web OSS that's truly ubiquitous – think vue.js, Angular, Python requests and similar. Their $$$ reward is based on installation numbers across Tidelift's subscriber base, not value added or cost saved.

Definitely not a model that would help most (read: more niche) open source developers.

For example, I maintain a Python library with 10k+ Github stars and millions of monthly downloads, and was told by Tidelift it's not even on their radar. Zero reward in Tidelift's reward system.

Which is not to say they're not helpful to others, they might be. Just to manage your expectations vs their marketing.