I see why you’re getting at, but I think you’re mistaken.
Rage-bait works by evoking a reaction. It spreads because people become incensed and then feel the need to share the reason for their anger.
This is the opposite of reaction. It is a calm response to the OP explaining why they are reacting to rage-bait and inviting them to reconsider their posting.
No, it is instead of tipping. That’s what they mean by “in lieu of”.
The question about prices is a good one, and the answer is that you can’t just raise prices when most other restaurants don’t include gratuity. It would just seem like your restaurant is much more expensive than everyone else.