Amazon is paying less tax on profit than any local business. That's one issue.
Another is that they pay their warehouse staff badly.
They also use their size to get special deals with postal & shipping companies.
They impose rules to build monopolies.
They are not a regular kind of business:
https://en.wikipedia.org/wiki/List_o...ions_by_Amazon
So it's not splitting hairs. They use their size & power to pay less tax than other business and have unfair trading advantages.