All the key provisions of the antitrust laws (sherman antitrust etc) have been effectively invalidated due to the incredibly high bar set by court precedents before a large company or (making a monopoly or oligopoly) can be sued effectively.
As such the large companies can dance in an effectively no competition space (well some parts have competition still, but other parts no). Any small business with actual innovation is going to have to pay in competition, and inertia, and harassment by incumbent monopolies to get a hold, and the monopoly is most likely going to copy (Whatsapp to Snapchat) or acquire (Microsoft store to blizzard Activision). So any small business owner will get to look forward to bankruptcy, or lawsuits until someone else eats your lunch.
Write your congressman about the antitrust laws? Start a business and hope you aren’t noticed doing something copyable?