I mean Fedora is open source but if they really wanted a european base, they could have gone with opensuse. AFAIK opensuse is the only fully european linux distro plus they use many of the same tech that redhat/fedora does.

Ultimately I think it doesn’t matter too much since even the linux foundation is based in the US and large parts of what makes the linux desktop are maintained by non-EU companies (on top of all the major projects hosted by Github, Gitlab including most of Flathub). If its all open source, I think the risks are pretty low e.g. huawei was able to use Android despite all the restrictions.

You can also get the appimage on https://www.gimp.org/downloads/

After downloading, set the execute bit: chmod +x ./GIMP-3.0.0-x86_64.AppImage and then open the file to open gimp.