Comment by dredmorbius

Marketing-it-harder has some effect, but it's limited.

If a monopolist can insist on terms (e.g., Amazon mandating lowest price guarantees from sellers, or Google mandating auth / compliance / KYC exclusivity to Google Play Services privileged devices by app devs), then threats to the compelled party (sellers, app devs) will be minimally effective.

Class action lawsuits, regulation, and legislation, are required for effective relief.