If you scour the old archives of that website (now mostly seized or blocked), the year 2015 was defined by these massive hits that were heavily pirated:
Filmyzilla operates in direct violation of the Indian Copyright Act. Filmyzilla 2015 Bollywood Movies In Hindi
The year 2015 was a landmark year for the Hindi film industry, characterized by a mix of high-budget blockbusters and content-driven independent films. The demand for these films online was unprecedented. If you scour the old archives of that