You should know there are 3 things possible for a user here in this forum that are not active as follows;
1. If a member is not active for a period of 2 years below you should know that such person has either find a better job and again that is much consuming their time in a way they can't really focused on this forum. Maybe who knows their job was a life changing one.
2. If a member is not active here in the forum for 3 year and above you should know that such person is either sick or dead or no where to be found, the covid-19 might have also contributed to the disappearance of members here.
3. Such person might have lost control over their previous devices and no longer have access to their account and the previous mail used in creating their account.
4. Their work or home-life circumstances have changed and they have found new adventures to fulfill and enrich their lives (such as getting a new girlfriend / extended vacation / retirement / divorce / marriage) - (similar to dot point one).
5. One or more of their alts have been exposed and they are playing it cool by limiting the number of alts they use for a while until such time as they reestablish themselves in new campaigns.
6. They are, or have faced court (such as those higher tiered members of the forum who have found themselves facing court action by a charlatan imposter and have semi permanently gone underground.) / Other court examples e.g. Chipmixer (see #8 and #9 below) / credit card fraud etc.
7. They have been *cough* asked to leave the forum.
8. They scammed others in the forum and/or have run off with the bag. (Yogg immediately comes to mind as do any of the crypto exchanges owner/operators
under a cloud (Big Vern from Cryptsy / Cryptopia etc., ))
9. Representatives of any websites that have been seized by local authorities - chipmixer / darkweb / et-al.
10. Alt coin devs or altcoin supporters (see 11 below)
11. (not counting the one post " >Thank You< " / " conversant " / " cloud mining " / " doubler " type sockpuppet type posts, but they and nuked users are a whole other category of inactive users)
12. Natural disasters or warlike conditions that have damaged communication networks for long periods of time.