MvPs can lose trust levels just like regular posters.
You can read more about the requirements here in this FAQ
You can also check your trust level using this tool. Just put your name in the bottom. Trust levels work on a character level so if you swap characters a lot you will take longer to build up the requirements.
https://trustlevelchecker.jodk.nl/portal/?region=eu
A workaround for posting links is to post the url, highlight it and then use the </> button.
www.demolink.com