They haven't though. There's a long term plan here, and the goal is power and wealth. Short term moves that appear irrational turn out to be rational (from a greed perspective) when you factor in other considerations, like: Use their own AGI to create every software product on Earth and swallow the worlds economy. And we're kindly feeding their systems our codebases, IP and business decision-making so they can do exactly that.
Not a single thing Anthropic has done has been altruistic, and it never will be. It's all smoke and mirrors for the end goal.
Why invent new motives for Anthropic when their real motives are plain and obvious and have been confirmed time and time again by their behavior over the last few years? Their concern is their own power and wealth. Every other conceivable motive is secondary to that.