If someone wants to build and train their own model that assigns a binary gender based on pictures that's their own choice, and because of that freedom they can't force google to do it for them.
Right, it's just that usually the concept with goods and services is that you're paying someone else to do it for you because you either can't or don't want to.
If I'm the author of the tool, I can impose whatever I want, no? It's not like people have a God-given right to have Google tag photos with genders for them.