https://hbr.org/2005/04/the-half-truth-of-first-mover-advant...

https://static1.squarespace.com/static/5654eb6ee4b0e19716ec5...

Showing how old I am with that reference

A more recent article https://www.productplan.com/learn/first-mover-advantage-fast...

I should say it’s “mostly” a myth, there are some fleeting competitive advantages to first mover but a lot of them don’t apply well to tech companies and there isn’t strong historical evidence supporting it.