Finance organisations are great at attracting talent by simply paying very high wages. The problem is attrition.
It's important to understand that lots of open source is developed for non-financial rewards.
If you hire a key engineer who is a top contributor to an open source project then you are preventing them from contributing anymore. They will leave.
Even if you allow them to continue contributing, but the workflow is onerous (e.g. MD-level reviews of their code) they will also get fed up and leave.
To retain these high-performing staff, you have to give them the right tools to carry on contributing effectively.