Look at the core maintainers of Rails for example. Many are paid by Shopify and Basecamp, so it’s much more commercial than your regular open source project.
Which isn’t a bad thing that people get to contribute on company time.
Again this is mixed causality. Rails did not take off because of commercial interests – besides dhh who was working on it on the side, all the initial committers were doing that for fun.
Eventually they brought rails in many commercial companies and these companies succeeded to the point they could pay people to maintain rails.
To be fair to RubyCentral, this year's RailsConf was the last one they have planned, though it's likely that they'll shift focus to on RubyConf in its place
gems and bundler is for everyone though, even hobbyists writing scripts. Alienating contributors who support common infrastructure for no good reason is just plain stupid especially when those projects wasn't theirs to begin with
Which isn’t a bad thing that people get to contribute on company time.