I don't understand, why docker is only available for Synology. While Synology is based on Intel-CPU's shouldn't it be possible to use it on other systems?

I personally use an Intel NUC which has Ubuntu and docker. The docker I am using are able to use on Synology too. But the Zappiti Server docker only runs on Synology.

My Media is on unraid (which also can use docker) and I don't want to buy a Synology NAS just for the Server-docker.

When docker on Intel based Systems are used, why don't let the user decide? I don't get the point of only supporting Synology.