2 years back, i uploaded a wildlife video which surprisingly became popular. A year back i noticed im now eligible for monetization as i had crossed the minimum

2 years back, i uploaded a wildlife video which surprisingly became popular. A year back i noticed im now eligible for monetization as i had crossed the minimum required numbers for Subscribers and Views. One month after applying i got rejected saying the content was duplicate. I thought it was a mistake and applied again and again to no avail. My guess is, someone has content-ID'd the video and monetizing it. The video now sits at 7M+ views and it occassionaly irks me knowing somewhere someone is making money out of that video.