I live in Ireland and our contact tracing app (using Google+Apple tech) seems to be doing well. There was about 1 million install 1-2 days after it launched, currently standing at 1.4 million installs (population is 4.9 million), along with some positive contacts reported:
https://www.bbc.com/news/technology-53525712
It was also donated to open source.
https://www.nearform.com/blog/ireland-donates-contact-tracin...
While that is useful I think each country will face its own challenges with adoption.