It think it depends on the SWE job or the sector, I remember right out of the gate even for commercial projects i'd be contributing straight back to open source b/c we were using the tooling. And a lot of google/meta engineers spend a huge chunk of their time working on open source. subversion ages ago and of course react and graphql all open source. Even JP Morgan had a super active fork of ethereum going for a while entirely open source on github, while jamie dimon was telling people he'd fire them for trading crypto 😂

so.... imo its really the circles you're exposed to, and its been this way for decades - so many opportunities in boston area too, can't even begin to count!