Copilot had 400k paying customers within it's first month [1]. I'm not a fan of mass generalization about large cohorts of people. Will everyone use a tool? Of course not. You just need dedicated early adopters that see the value add.

Without having tried it I'm assuming either their product was not good enough or their marketing department isn't strong. Developer really tend to neglect the latter.

[1] https://www.ciodive.com/news/github-copilot-microsoft-softwa...