Many believe that companies should give more time to employees to contribute to open source, with 79% agreeing or strongly agreeing that companies should give time during work hours to contribute.

while just 20% have been paid for their contributions to open source, 53% agree or strongly agree that individuals should be paid for open source contributions

And yes, at TRB GmbH, we do pay people to work on OSS

I'm working full time on Material-UI since 2019. I was working on it during my free time before that. I hope that I can leverage my full-time involvement in the library to make it really awesome. You are right, the project is well-funded. We hope we can fund the time of more than 1 person full time in the future, with the current growth rate, it should soon be possible. We have 3 people working part-time on the project (Matt, Sebastian and Josh), plus the community behind us (+1,000 code contributors).