Once they were sold to SoftBank ARM had no more control over its destiny. You're saying that they're repeating the pattern, but they had no choice in this today. This was SoftBank's decision as the owner of ARM.
Buying a stake in AAPL,FB, or any tech company would have netted higher returns for less effort than buying ARM. If anything, a 25% ROI in 4 years is quite poor.
