The old joke is if you charge more than your competitor, you're price gouging. If you charge less, you're anticompetitive, if you charge the same, you're colluding. Basically, government can arbitrarily terminate any business it so wishes.
If you do any of these in good faith then you wont run into any trouble.
* If you aggressively price to extract almost all of the value of your product or service because of an unnatural (i.e. not market based) advantage then you're price gouging.
* If you purposefully operate at a loss with the intended path to profitability being raising your prices later then you're being anti-competitive. We want to reward companies for real efficiency, not just who happens to have the largest VC war chest.
* If you charge the same as your competitor in good faith and don't find yourself in the first bullet because of collusion then there's no problem.
Both have been kicked out of markets for not playing by the rules.
Now they may both "win" in the end and make many billions, so the end story may be "focus on growth not playing by the rules, if you have enough money you will eventually win anyway"
