Do we have any actual numbers on that? I feel like developers (and power-users generally) have internalized this notion that we're a rounding error compared to the general public (perhaps a holdover from the old days, when regular folks didn't use the internet or computers at all). But in 2020, software development is a massive portion of the economy, and Macs seem to be disproportionately popular with startups and developers.
A little lazy googling puts the graphic design industry at $12.7 billion, and the software development industry at $388.98 billion.