The Competition and Markets Authority is currently examining the health of the UK cloud market, and has so far found "competition is not working as well as it could". It estimates AWS and Microsoft account for up to 90 percent market share of the £9 billion customer spent on cloud computing in 2023. Google, IBM and Oracle accounted the next biggest portions.
You do not want 90% plus of your national cloud services market market to be relaint on companies all from a single foreign country. Especially a country that is known to be unreliable.