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

Or the newer version:

> My point was not about copycats, it was about platformization. Apps that you "live in" all day have pressure to become everything and do everything. An app for editing text becomes an IDE, then an OS. An app for displaying hypertext documents becomes a mail reader, then an OS.

So in turn, every product becomes bloatware that needs more money to maintain and more users to get more money.