Anything spinning will gravitate to the ecliptic. You are asking "Why"? Then my response will be 'angular momentum'. Then you will ask what is angular momentum? Movement. What causes movement? At that point we need to go back. We need 2 causes to manifest to a singular effect. What is movement. What is charge? What is magnetism? In the material, they are inseparable. One cannot exist without the other.

So, back to the question, So then why is everything bound to the ecliptic

Because of the way movement of a charge moves through its self created field of magnetism. The only way it can be stable is the charge moving laterally through the sphere of dipoled magnetism, which eventually causes the sphere to invert back in on itself.

Since this original form can only be stabilized by lateral movement, then it will be a natural tendency for all spinning geometrically spherical shapes to have an angular momentum that is bound to gravitate towards the ecliptic.

I guess.