You can’t worry about it. It’s the world we live in now. The alternative is to not write anything of significance on the internet, which would be of no benefit to anyone.
That doesn’t mean you can’t work to change the world, and in fact in order to do so you first need to see how it actually is.
But it does also means you need to decide which battles to fight.
Letting a AI learn from your content devalues it as they can regurgitate it for a few dollars a month.