Has anyone ever switched clouds from one service provider to another (e.g. AWS to Azure or vice versa), partially or entirely?

If so why? They all offer almost identical services. Do small (but maybe significant?) differences or unique products (e.g. Spanner) make such a big difference that it has swayed someone to switch their cloud infrastructure?

I wonder how much these little things matter and how such a transition (in partial or as a whole) went along and how key stakeholders (who were possibly heavily invested in one cloud or felt they were responsible for the initial choice) were convinced to make the switch?

I'd love to hear some stories from real world experiences and crucially what it was that pushed the last domino to make the move.