Sec. 16 of the Clayton Act 1914 - any person threatened with loss or damage by a “violation of the antitrust laws” can obtain a court injunction. You can also sue for treble damages if you can show you actually suffered monetary damages.

Monopolization, under the Sherman act, requires “the possession of monopoly power in the relevant market”. The relevant market here is the App Store/iOS. Monopoly power means substantial market power that is durable rather than fleeting. Market power means the ability to raise prices profitability above those that would be charged in a competitive market (i.e., 30% tax would not be charged in a competitive market).

Of course there’s other issues, but on its face Damus seems to have a valid cause of action against apple for violating anti trust laws and damaging Damus’ business.

Is it time for a Damus legal fund??