Its not like that. If anything cycling has less doping than most sports. Cycling has been very serious about doping for much longer, than most other sports. Infractions are punished very hard; a guy like Hessmann had his career paused for a year plus, while also losing his contract, even though he hadn't doped. While a tennis star get three months for a clear doping infraction. Cycling also bans more substances than the international doping authorities does. As an example did cycling banned tramadol and other strong painkillers, while other sports don't care.

You have heard much more because from cycling over other sports, because the other sports don't want their dirty secrets aired out, and you heard about the huge scandals in cycling in the 00s.