It's more time consuming to go through a thread like this where communication happens "all at once" for all types of issues. It makes more sense for them to have an organized system where they can go through them one at the time. Plus, not all Zorin OS users are active on this forum, and implementing a form independent from it would make sense.
Nothing is being forced on anyone. People are free to install/uninstall whatever software they want. As for why Brave and not Firefox:
@Omnimaxus I forgot about this one. Apparently going forward people will have to set up this repository separately on their own: