The term you're looking for is 'Horizontal Conduct' and it's illegal. The hard part of course is making that claim against the team of lawyers that Google would be able to field.
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Here's another fantastic article related to this. It's about someone who's had to give up on selfhosting.
It's actually far worse than the Igregious article makes it look.
Could someone please ELI5 this? I get the overall concept but I don't really understand why doing this is convenient for them.
Email is a relict of a bygone era and needs to die. It's not designed for the modern Internet, and no patching like DKIM and DMARC can fix that.