Why did Rita and Zedd give up the Earth?

[Gosei Gold]

Zedd and Rita seemed like they were poised to renew their invasion of Earth after Zeo. Yet Divatox became the main villain and Zedd/Rita seemed to give up on Earth.

[MattEmily]

That's a good question but the way that I see is that there could be 2 reasons either that was when Rita became pregnant with Thrax or they were ordered to stop their assaults on the planet.

[Space Nerd]

Dark Spector must have pulled them a lot earlier than Divatox. Thats probably one of the reasons Rita hated Divatox.

[MMPR Guy]

Maybe they found a new planet to conquer and were sick of our Rangers?

[Green With Envy]

I always assumed allies of the Machine Empire chased them away. Could have even been Mondo and Machina themselves. Since we saw them in operation in Space. There had to be a good reason. Since Zedd and Rita wanted Earth bad.