Historically, dubbing was an afterthought. Major Hollywood studios would only dub their absolute biggest intellectual properties—like Jurassic Park or Avatar —into Hindi, largely ignoring the Southern languages. South Indian regional industries also operated in silos. A Tamil hit would occasionally be remade in Telugu with a different cast, rather than being dubbed.
"Telugu Dubbed. Net" is a symptomatic representation of the broader digital piracy ecosystem. It thrives on the high demand for regionalized (dubbed) content and the delay or geo-restrictions sometimes applied by official OTT platforms. Telugu Dubbed. Net
Here is a comparison of the best legal alternatives available: Historically, dubbing was an afterthought