In the first six months of lockdown in the UK 6500 prosecutions were undertaken by the Crown Prosecution Service (CPS). These included non-lockdown flouting crimes which were simply flagged as 'Corona Virus related', such as threatening to cough on somebody whilst 'infected' and stealing items deemed essential for dealing with the pandemic.[1]

Your assertion that a million people were prosecuted seems far fetched.

1. https://www.cps.gov.uk/cps/news/6500-coronavirus-related-pro...