The ESM and other open issues they refer to are serious. Jest often doesn't work at all if you use packages with multiple entry points (like firebase), which is often seen as best practice - it's gotten to the point that people release third party loader packages to make jest work, like https://github.com/k-g-a/jest-node-exports-resolver

I don’t think the post you linked to says that. Unless the open collective is a Facebook thing?

Not compensation, reimbursement for expenses