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US tech giants warn Europe that ditching US tech giants could cost €115B
(www.theregister.com)
This is a most excellent place for technology news and articles.
That's what it'll cost the tech giants.
In cases where I've worked on projects to transition to open source, they've all ended up saving money: capex goes close to zero, and opex starts out higher due to learning curve, but then drops below the old baseline in a few months.