This isn't the FTC's complaint but search "How Amazon treats their workers" and see why large companies get attacked. Typically the only way you're going to become this large is by abusing people in some sort of way. Amazon abuses their workers, their sellers, etc. Meta abuses their users. Google abuses their users. Uber abuses their drivers.
I would love to see 20 Amazons where half have a decent quality of life for workers compared to 1 Amazon where it's just awful for everyone except maybe consumers (debatable), executives, and tech workers.
Likewise, quitting your job is extremely disruptive and carries risk of bankruptcy if you can't get on to another employer in time. It's not simply a matter of "switch to the best offer available".
But go to /r/starbucks and you'll sometimes hear that a lot of small shops are worse, for various reasons.
Large companies attract certain classes of criticism not by being worse, but by being more visible. Unfortunately, this actively masks some of the wrongs that they actually do.