There is an elephant in the room, and the elephant is called dual licensing. In my opinion, this is a more severe abuse of open source than what Amazon does.

When RMS introduced GPL the idea was to make everyone share their code, and make the world a happy place full of free Software. Dual licensing abuses this sincere intent to induce fear in commercial users and make them pay.

So using a dual-licensing scheme prevents people from considering authors of SSPL the new leaders of the open-source community.