It’s fully open for everyone on the forum. It says that each month we have 451 active different users. It’s close to 300 per week. Next to that we have a lot of guests:
So if 300 active users per week log in to the forum creating 40486 API requests. Then how many users are anonymously creating 37851 ones? I guess it’s more than the active users because the active ones are like euh… active.