I believe it was banned because people were going on monster rides rather than getting what would generally be considered 'exercise'. The trouble is for a cyclist an hour is barely worth getting changed for but for the rest of the population and hour on a bike is unthinkable.
Why in countries where cycling is held with more regard have they already banned it?
Bike riding is extremely low risk but at a time where the NHS is focusing every resource to this epidemic, why not make a small sacrifice?