I don't know if it's just my impression or what. And I don't know if it's just a coincidence. What is clear is that if you open threads (if they don't suck) it's easier to get merits. I don't know if they know it and that's why.
I don't think you noticed anything new, it's probably just that more individuals have appeared who are full of enthusiasm and give the appearance of what you noticed. If we look in the Bitcoin Discussion we can find a few examples.
Only the two of them are responsible for about 15 threads in the last 7+ days. Someone does it for the sake of merit, someone to promote their service, but I believe there are those who are honest and eager for discussion. It is quite clear that every quality open thread brings merits, and that it cannot be compared to any quality post buried in a mega-thread - some of them know that for sure.