Have you noticed that Product Hunt users often become less active after a few months?

usually it happens after the laucnh haha

Since they have started phone number verification.

It seems to me that a person's activity is on the rise before the launch. Networking and activity are built up. After the launch, a person by inertia still remains on the platform and continues to communicate with the platform. But this is already on the decline and then completely switches to other tasks.