Not going to repeat what was already said. Just want to add that nothing strange that you don't see many old users without paid signatures who are still active. That's normal thing. Go to any random forum, find posts made 10-15 years ago and you'll see that most users who wrote it aren't active anymore.

That really makes sense, never thought about it. It's getting a bit off-topic, but I never use all these BTT, BCT and etc. Bitcointalk simply isn't such long word that can't be written in full. All this shortening of words reminds me times about 20 years ago when people used brick phones like Nokia and avoided writting full words in SMS. IIRC, then SMS were charged by nymber of symbols used, so, people tried to make it as short as possible.