It doesn't have to be explicit "use X% of your time to contribute to open source" to count as getting paid to do it.
When using OSS libraries on commercial products I've found the need to fix bugs or other problems and have sent pull requests with those changes afterwards. Granted not all clients approve this, but I wouldn't describe it as "few-to-no other companies" that allow it.
When using OSS libraries on commercial products I've found the need to fix bugs or other problems and have sent pull requests with those changes afterwards. Granted not all clients approve this, but I wouldn't describe it as "few-to-no other companies" that allow it.