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Because it is in google/netflix's interest that net neutrality be abolished.

How so? How would Netflix benefit from NN being abolished?

They've reached a market position where NN doesn't really impact them much. They, now, have the cashflow to pay their way out. They can pay, smaller companies cannot, thus cementing their position in the market. Absence of NN, in an indirect way, helps them competitively by constructing artificial barriers to entry without taking the heat.

Sure ISPs have their own equivalent offerings, but dealing with one or two competitors in an area is easier than dealing with a couple of them.

Not so when their major competitors are literally part of the ISPs they have to negotiate with.

I know Netflix has pretty good penetration and awareness with customers, but people are fickle and will jump ship as soon as something better (or less shit, due to less bandwidth squeezing) is available.

What would they legally sue for? Just suing for an environment that existed for only 2 years, because they feel it is right, is not the purpose of a lawsuit. That needs to come through legislation.

Not a lawyer, but would guess because it would be a waste of their lawyer's and the court's time.