Calling FOSS devs "competitors" is such a corporate-minded statement that completely misses the point. FOSS devs all work together to achieve a common goal and don't see other projects as competitors, they see them as friends.
I agree, that what I literally tried to qualify it... Goddamn some of you seem to write comments with the sole purpose to disagree with the smallest of things.
Competition for non-monetary resources is absolutely a thing. Developer time is scarce and other projects can absolutely see others as competitors in this regard. We have plenty of stories of project forks sprouting because of frustration/disagreement/etc and the new fork starts gathering more attention/contributions because of better governance, better devx, saner environment, etc.