There is no such thing as a ActivityPub node whereas there is such a thing as a Mastodon node. It is simply the other way round. It is the same with every

There is no such thing as a ActivityPub node whereas there is such a thing as a Mastodon node. It is simply the other way round. It is the same with every protocol and its implementations. You run an Ethereum node, not a "Geth node" or a "Mantis node". You run a BitTorrent node, not an "rtorrent node" or an "qBittorrent node". You run a webserver, not a "Django behind Nginx server".