Why does riot nerf every champion I play?

Everyone thought Mundo Jungle sucked in mid s4. It was clearly not a meta, and everyone railed at me for picking mundo jungle. However, I figured out a strategy and implemented that strategy. And people started to think that Mundo jungle is ridiculously op(this was before the change to the Spirit of the Ancient golem(tenecity)), and a week later, riot nerfed Mundo's cleaver volume, and two weeks later they reworked the Sotag and buffed turret dmg.

Here was my strategy. Back then Mundo was the fastest clearer in jungle(even in mid s4) faster than shyvana(idk about godyr). So, I cleared camps super fast, ganked once in a while landing my cleavers like a pro. Mainly those faster clears let me lvl up faster with more gold, getting early Sotage with ninja tabi, and dived turret with my ult every gank when enemy champion were still squishy as fck and with my w and tenecity from sotag any cc lasted less than 0.5 sec, and no enemy jungler could 1v1(or even 2v1) me even when I ran ms quints.

People started to think that Mundo was op as hell when it was clearly not even the meta, and riot nerfed him and all items associated with him in jungle. This is what happens when a mediocre champ shines in bright light. People will think it's unfair and nerf him.

I got pissed and uninstalled the game.