Would Kahoot! consider adding "per created kahoot!" micro-transactions? In other words, I wouldn't mind paying a dollar or two to have access to all creation tools when I make each Kahoot! game. I don't want to pay a monthly fee, but charging me a small fee each time I create a Kahoot! may be a viable revenue stream for you and certainly more amenable to me than paying each month when I don't create that many Kahoot games...