They get hated on because :
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they inspect packets. They terminate the TLS sessions at their servers and reencrypt to forward to the backend. This allows them to analyze the data to spot spam, optimize compression and such
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they are used everywhere. If they go down, 30% of the internet goes with them.
Neither, a centaur has a human torso starting at the base of the neck, the left one has a long neck so clearly not a human torso. The left one has a long torso, so that doesn't fit either.
Solution: it'd be exactly like a regular centaur but with a different skin pattern