I literally can. Please don't spread misinformation when I doubt you even are a Finn.

https://lupakuvienvastaanotto.fi/Default.aspx

E: not to mention that the page you linked doesn't even say anything about prohibiting self taken photos.

You can register as a photographer very easily. I've been doing my own pics for years now.

You don't even need to register as a photographer (to submit other people's photos). You can do it as an individual just fine, as the submission page directly mentions.