I secretly learned my childhood bullys identity and have been subtly ruining his life for years

I was tormented relentlessly in middle school by a kid named Mark. He made my life a living hell for years and I never told anyone about the worst of it. Fast forward to a few years ago when I stumbled across an old year book photo and somehow managed to track him down on social media. Seeing him living his best life really bothered me so I started digging. I found out where he works and I've been anonymously sending his boss little 'tips' about his perceived laziness or minor screw-ups. I also managed to get my hands on a few of his personal details and have used them to lodge fake complaints about him to various services. He doesn't know it's me obviously and I feel a twisted sense of justice watching his life slowly unravel.