It was already a thing for the longest time and people would make a huge stink about where to put their threads if they accepted both TBT and IGB. It can come off as confusing for new users, too. It's easier and more convenient to keep it to one forum.
And if a shop just asks for purely one currency you don't have, go to another thread.
And if a shop just asks for purely one currency you don't have, go to another thread.