Hiring a hitman is illegal, so the president could still be prosecuted for this. Assuming the House/Senate aren’t complete morons, they would impeach and convict the president.
Doesn’t the US hire thousands of hitmen with drones and call it the army? Or the CIA? The president can have someone killed no problem using the tools of the state.
Something really weird and interesting is Gemini Gemlogs. Technically not WWW, but still an internet platform.
Something more normal and accessible is Hugo.