Alternate title: Amazon destroys the livelihood of thousands of merchants without process or appeal.
Competition law exists precisely to stop monopolies from saying "it's our business so we can make the rules".
If your career and income are entirely reliant on one company, regardless of type (tech platform or retail or college or whatever), you're beholden to their whims and whether or not they stay open. It's a good idea to diversify your income if possible (via savings and investment if possible).
Further, this is even more of an issue if your income is selling and buying via online platform. They may not shut down, but they very-well may change the TOS to exclude your type of selling. . . . Which is what this is.