In that case Amazon is your book seller. They may also be a publisher through Kindle Direct Publishing.
> If I rent my home out on AirBnB, is AirBnB by land lord or realtor?
You'd best check in the jurisdiction where your home is, but it is more likely they would be a property management company.
> If I offer to fix plumbing via craigslist, is craigslist my employer?
This is a bona fide activity performed by contractors.
> So, if I offer to much of my services on a platform am I to be employed by that platform?
There is a reason why we don't see Uber drivers advertising on Cragislist but lots of ads on Cragslist to hire drivers for Uber.
In that case Amazon is your book seller. They may also be a publisher through Kindle Direct Publishing.
> If I rent my home out on AirBnB, is AirBnB by land lord or realtor?
You'd best check in the jurisdiction where your home is, but it is more likely they would be a property management company.
> If I offer to fix plumbing via craigslist, is craigslist my employer?
This is a bona fide activity performed by contractors.
> So, if I offer to much of my services on a platform am I to be employed by that platform?
There is a reason why we don't see Uber drivers advertising on Cragislist but lots of ads on Cragslist to hire drivers for Uber.