It hasn't really, FOSS has grown more in the last 10 years than it did in the 50 years before then

It's used by basically everyone, though some apps don't advertise it or have the foss thing so deep in the code that you'd not know without looking at the code

The solution is to move away from GitHub tbh, who are actively encouraging people to use LLMs, to other hosting options that don't have built-in LLMs, such as Codeberg, Gitea, etc