I will look into this and see what I think about it.

Is it focused on US? If so, I will not be able to use it much since I live in Europe.

Yeah, I want to be able to upload my trails as well. My plan is to set up Endurain on my server and transfer everything from Garmin to my server. Then I can select trails and upload to Wanderer or other sites. That way I will be in control of all hiking/running/mtb that I do but I will still contribute to the community by adding routes.

Depends on the user. An older family member, Linux mint. A gamer, cachyOS. Otherwise fedora could also be an option. But in most cases, the person would choose and install a distro themselves if they are interested and that means that mint becomes the most common answer to the question.