Having RAVANA for a brother drove this demon to goodness.
He needed to do his own thing — how could he hope to compete with the undefeated ‘Top of the Complete B*stards’ world champion? So VIBISHANA gave up telling fibs, prayed to BRAHMA, received blessings and tried to persuade his brother kidnapping RAMA’s wife SITA was not a good idea, and joined RAMA’S army to prove it.
For being on the side of righteousness, he was granted immortality and made king of Sri Lanka. What he is doing at present is open to speculation. He could be something big in the export trade.