If there is a new player in the field, what or who is going to stop FAANGs from buying the competitors (even it violated the antitrust law)? Sure we do have Sherman Antitrust Act for this... but no one bothering to do the enforcement and the companies are not going to stop for the goodness of their hearts.
We cannot expect the small/newcomer companies to try to compete against FAANGs and hoping thing changes. The only way we can get the enforcement seriously is the Congress itself. Frankly, the Congress prefers to listen to their corporate masters over their constituents.