This whole "Gender is a spectrum" argument is a little odd for me.
Because gender is a spectrum. There are many more genders than male or female, both sexually, biologically, mentally, etc. But I don't see why we should force these quizzes to reflect this. The people making these quizzes, I would hazard a guess, range from 7-12 years old. We should not expect 7-12 year olds to know about this stuff.
And these quizzes aren't supposed to actually reflect your gender. If I take one that says I'm a girl, I don't have to act like a girl from then on. Just like as a boy, I don't get offended if I get a girl, I don't see why someone non-binary would get offended if they got a girl. I would expect any rational person to recognize that these quizzes don't actually reflect a deep part of their character.
The main problem though, is that let's say the people fighting for this gender spectrum on Hopscotch got their way. These quizzes now included the whole spectrum. The only way the coders would be able to implement it is to be utterly transphobic, and sexist. These quizzes, as have been pointed out, are based on stereotypes. We already have the issue of stereotyping boys and girls based on colors they like, professions they like, which is terrible. But objectively more taboo is stereotyping transgender, non-binary, and genderfluid people. Not only that, but most of the stereotypes that do exist for them are incredibly homophobic, and offensive in general. You really want these kids learning about these stereotypes at a young age so they can implement them in a game?
The way I see it, the stereotype argument is the only one that I agree with. It is stereotyping girls and boys. Whether that's allowed is up to the Hopscotch team. But I wouldn't lose too much sleep over it - these are kids making a game. They aren't trying to be offensive. This is how 7-10 year olds think.