We should of course be mindful of whataboutism when discussing these things but I think it’s a good idea to consider the economic and social context when talking about these issues, they don’t exist in a vacuum.
Deflecting criticism with "some workers have even more upsetting conditions than these" doesn't help either party, moreover it actually shuts down an important discussion relevant to both. We shouldn't tolerate any business crushing dissent the way Amazon does; that's what is being discussed here.
[1] https://www.vice.com/en/article/5dp3yn/amazon-leaked-reports...
This discussion isn't explicitly about the working conditions of Amazon, it is about the highly unethical methods they use to crush dissent and workers organizing, namely the leaked documents that detail actions including the spying on workers suspected of organizing even outside of work by the Pinkertons.
This isn't the 19th century, this deeply upsetting and unconscionable behavior should not be tolerated in the 21st century.