You’re saying that the system’s apparent behavior is by design, but wasn’t that design put forth by employees of the company in question? These aren’t natural phenomena we’re discussing. When a puma tears apart a rabbit, it does so without any influence from the agency of man. Gmail’s “spam filtering” is no such thing: it was deliberately designed to work this way by paid professionals who knew what they were doing.
the next step of analysis is that they behave this way to capture more growth and market share, which they must do under capitalism or lose out to any more ruthless company.