I thought Mylio was self-hosted, or at least had the option of it?
Very funny that "Nextcloud Memories" isn't in the "Memories" circle. Not sure how Nextcloud Memories compares to Nextcloud Photos, or why the former is chosen for this chart rather than the latter. Both seems nearly identical on this comparison of FOSS image libraries.
Since this is not just about FOSS, I would rather like to see where Synology Photos sits.
Are you absolutely certain? I've seen people claim that before and be wrong, because they were again confusing copyright infringement with plagiarism. It could be a translation issue where the law against copyright infringement is sometimes translated as "plagiarism" despite not really fitting the English-language understanding of the difference between the two.
I couldn't find Niuean references to verify it in your case, but my comment was accurate under Australian, UK, Canadian, New Zealand, US, and EU law. It's possible some individual EU countries may differ, but not at the EU level, and certainly not in Slovakia, Germany, or France. So I am confident in using my comment as the general "default" assumption for discussions in English on international forums.