[yorwba]

The evidence is not the small proportion of women in tech, but that it gets smaller when you compare countries where women have little freedom to decide for themselves to countries where gender equality is enshrined into law and women earn as much as men. So individual freedom appears to lead to fewer women choosing a career in tech.

That doesn't necessarily mean that no discrimination is going on. For example, both medicine and tech could be discriminatory, but medicine slightly less so, and women choose the better one. But any possible explanation needs to take into account that women do have a choice and they choose differently from men.

Offering scholarships might be able to tease out the difference, although it would have to be applied at much larger scale. If every student of medicine were offered a scholarship to learn programming instead, how many would switch?