I'm an alumni of one of the big accelerators. We have had long internal email threads about Amazon strongarming smaller ecommerce startups with mandatory stock warrants as a precondition to sell anywhere on amazon.
For example, amazon will force a startup to give amazon a warrant to buy 10% of the company at a discount.
They have frequently tried to figure out what customers ultimately want and SHUT OFF accounts of sellers on amazon ... and gone and listed those products themselves.
Amazon is extremely famous for arm twisting anti-competitive and anti-startup policies.