Great feedback, thank you for that!
The thing is that we want to make it as easy as possible for people to contribute. The idea of a Git repo came up but that would make it way more complicated for the average Joe to contribute. Therefore we went with the "form on the website" way. Right now, as we have a lot of people suggesting content from Reddit and Lemmy, we have lots of IT/Tech content. In the future we hope to attract more and more non-techies to extend the database in that direction as well.
Hope that makes sense.
That being sad, duplicate suggestions happen (not as much as one would probably think) but once we have a more complete data set, it will probably slow down too - so I guess it's not that big of a problem. There is also the "Report erroneous" data on the entry pages (after clicking on the name of an entry). This is a great way to send in correction for specific entries.
When it comes to your suggestions itself: To me it looks like all five have Non-European parent companies, so the tag was added for all of them. The antivirus products all seem to now be under "Gen Digital". The "open source" part is a bit more tricky as one can debate whether "open source client softtware" is sufficient or if the whole product (including the server side) should be open source for it to be counted as "open source". Right now you have to trust the server side while being ensured that the client encrypts the data. This is a step in the right direction but not completely open source. Right now we only set it for completely open source, meaning both client and server side. This is why based on your suggestion we added the tag obviously missing for Murena.
Thanks again for joining this small community and giving valuable feedback. It is appreciated!