Well I dropped from Trust level 3 to 2 within a month or so. When I wrote asking what happen, this is pretty much all that was explained to me:
We are not able to go into details regarding trust levels or expand on what is needed to get or maintain specific levels, but you can drop from certain levels if you do not maintain activity.
Any forum penalties received would have further details in your email at the time of the penalty. That said, your current trust level is not related to penalties and is related to general forum activity. I would recommend continuing to be active on the forums and your trust level will rise.
Bottom line…It’s not worth it for me spending my life on the forums just so I can post links.
PS: Just thought I would post this message in case you dropped a Trust level and wondered what happen.