The thing is, price tags for cloud services are so much higher than what data center costs would be for hosting an equivalent service yourself that I doubt that

The thing is, price tags for cloud services are so much higher than what data center costs would be for hosting an equivalent service yourself that I doubt that the electricity rate difference would make a cloud service in Germany outright uncompetitive. What is 40% in data center cost may very well be <10% in cloud service pricing.