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https://www.msn.com/en-us/news/technology/why-do-the-planets-in-the-solar-system-orbit-on-the-same-plane/ar-AAOG5Wv?ocid=msedgntp
Earth is flat. Don’t let them tell you otherwise
The government lies at every opportunity
Supposedly it was because of the out-of-plane orbit that it has, Pluto was demoted.
Among other reasons.
I think the same force comes into play on Earth as well. The Earth is a bit deformed, and the tendency is for mass to move towards the equator (lots of other forces at play - so it's not super clean).