Giving away a large share of the value a firm could capture is a growth strategy, not a sacrifice: a markedly better deal for users wins share, share brings data and resources, and those fund a better offer, as with Amazon and Google. The same flywheel that climbs the efficiency surface ends in dominance, so it stays good only while users can still leave and rivals can still enter; once share is locked in, the firm can switch to the capture surface.

Evidence 2 passages

groundsThe Narrow Corridor
Once it had a large market share, Google could use more data from user searches to refine its algorithm, making it even better and more dominant
groundsThe Narrow Corridor
Early success also brought more resources to invest in research and development