I am also confused. Perhaps they have an earlier court decision that enjoins them from banning sellers for this kind of activity? Failing that, perhaps they're

I am also confused. Perhaps they have an earlier court decision that enjoins them from banning sellers for this kind of activity? Failing that, perhaps they're seeking the court decision so they can't appear to be biased, in future courts eyes or in the eyes of a potential anti-trust suit? Keep in mind Amazon is basically both a provider here (of the "Amazon selling platform") and a consumer of that platform ("Sold by Amazon") and weird hybrids in-between ("sold by X, fulfilled by Amazon"). It could simply be that Amazon does not want to be seen as banning their competitors. Funny situation, I hope the courts understand it well, which may be part of why Amazon is bringing this suit so they can define the terms and the tone of how the suit is eventually brought.