Oh, if Disney Corp could use the mouse pointer or the one on your desk, or even a living breathing mouse, or whatever else mouse or not rest assured - if killing you somehow benefits them they’ll do it. They might do it from sheer incompetence too and they’ll try to write it off as business as usual. Also, it applies to anyone you know for good measure.
Sure, they might’ve cornered the market fair and square, but they’re certainly doing anticompetitive things in keeping it cornered.
Just try setting up a mail server not connected to any of the big corpos (Google, MS, Cloudflare or their clients with more niche marketing) and see who will actually recieve your mails. You most likely won’t land into the Spam folder either.