I suspect the data in the UK (where I originate) would be pretty messy. The voting lists there are a free for all, I reckon!
Duplicate voter data is clearly a non-issue, even according to their numbers. 400K+ duplicates with 61 cases of voting twice -- 122 votes. While there are the few and far between elections where this would make a difference, such a low number is a non-issue.
Indeed there is certainly not mass voter fraud. We were glad not to find that, but tbh surprised that we found any at all. Originally we were only going to look for duplicate profiles - it didn't even occur to us to look for actual fraud.
But why not make it a complete non-issue? It would be so easy to fix this data so there were no duplicates, then there would not even be any accusations like there were in 2020.
What I want to create is complete trust in the data to avoid the... bickering later.
/edit - as the poster below mentions, the 61 were just the ones that were manually confirmed. There were 1000 potential cases.