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Zawinski's law of software envelopment:

Every program attempts to expand until it can read mail. Those programs which cannot so expand are replaced by ones which can.

Another of jwz's laws is:

Any social media company will expand until it behaves like a bank; receiving deposits and making loans to customers (not necessarily users).

The modern angle on this rule is that "Every program eventually adds text chat, and they're all incompatible with each other."

Isn't mail just another form of text chat?

Yes. That makes it the more general form of the original law.

The incompatibility is the key feature that differentiates modern text chat from those inferior mail applications.

Somebody took your idea quite literally: https://www.coi-dev.org/