The most important difference in approach by different European countries appears to be the idea of a central location tracking database ... some countries regard it as necessary, others regard it as a step too far. It remains to be seen whether the early results of relaxing lockdown will change that debate or whether concerns about freedom of movement and privacy will dominate the debate. 

In practical terms, it means the tech companies' rapid work to create anonymised tracking may not have the positive impact it may otherwise have had.