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Thank you very much Debbie. That really clarifies a lot and explains why I have 2x more matches in MH compared to FTDNA, although MH is a bit more popular in Poland, I think, also because of the multiple languages it can be used in.

I was really surprised to see that 16-20 percent of child-only matches are considered a good result.

"The last step of DNA Matching is filtering out false positives and estimating the specific relationship between two individuals with shared DNA segments. Because many of us are descendants of the same very ancient ancestors, we often have tiny shared DNA segments with individuals we wouldn’t really consider family. We sought a method to filter out such matches that only frustrate genealogists. To this end, we measure false positives internally by looking at?trios?— these are sets of child, mother, and father who were all tested with MyHeritage DNA kits, and received results that validated that the relationships between the parents and child is correct. Any match that a child has with another individual, who does not match neither the father nor the mother is suspected to be a false positive and is called a?child-only match. We measure the percentage of child-only matches among all matches that are returned for children in all known trios on MyHeritage, and this figure is called the percentage of suspected false positives indicated by child-only matches. We managed to bring this figure down to 16–20 percent, which is a good result that as far as we know is equivalent to or better than all other DNA services.?Our improved classifier algorithms have succeeded in bringing our false positive rate to an all-time low."