if I have disabled the "Show others your online status?" option, why does it still display the exact date and time of my last activity after 72 hours?
I'd say it should only show the date, not the time. Or even just the month.
Or just stay active, don't abandon Bitcointalk for more than 72 hours

I do feel a lot of genuine users got banned cause accidentally they got logged in the same time.
Tagged: maybe.
Banned: no way. Just like users aren't banned based on similar IP addresses, the won't be banned based on their login time.