>In my head i’m thinking: “If their leetcode-engineers are that good why do they have rely on my open-source?”

>What would you do in this situation?

I would ask out loud “If your leetcode-engineers are that good why do you have rely on my open-source?”. Mind you I did that once when company I was contracting for wanted to hire me full time. They went with someone else with brilliant CV and ace whiteboard skills. They got in touch almost a year later asking for a rescue mission when nothing worked anymore, made more money contracting again than if I would work there full time.

How about you ask them for consulting gig instead?