Why only we can suggest swift and C language quizes and not others

Question

I wanted to suggest a html and a java quiz but I can't.
Also rate some

Answer 1

I want to create quiz but I don't know what is swift

Answer 2

SoloLearn has enough html java quizzes, they need a lot more swift and C do they incentivize the community by restricting other languages, hopefully to get more people into swift/ C