As a datapoint on Sweden, we have a normally pretty well functioning breast cancer screening system where women between 40-74 are to be offered a screening opportunity every other year.

In 2019 more than 800 000 screenings were done (with 8288 cancer cases discovered in the country that year) and this system has been credited for pushing down the yearly cancer deaths due to earlier discoveries.

In 2020 there was 160 000 less screenings so we can probably expect an increase in number of deadly cases in the coming years.

(Source, https://www.dn.se/sverige/en-av-fem-kvinnor-screenades-inte-... )