However, open source is almost 100% about "selfish" things like exploration, passion, relaxing etc. as shown by the number of projects that have exactly 1 maint

However, open source is almost 100% about "selfish" things like exploration, passion, relaxing etc. as shown by the number of projects that have exactly 1 maintainer (almost all of them). Linux and friends are exceptions and majority of devs working on those are payed by big corps and that is their regular job.