ZeroTier auto-joining "IceWhale-RemoveAccess" network on CasaOS?

Hi,

someone on Reddit recommended me to post my question on the forums.

I have two Orange Pi 5s running Armbian and on top of that they are running CasaOS.
Both of them have a Zerotier container running and are clients in my private network.

While checking my network lists on both of them, I noticed that they have joined a network called IceWhale-RemoteAccess without any of my input:
image

IceWhale is known for the Zima Board/Blade and CasaOS. Making me join their network without any of my input, isn’t it a security concern?

How did that happen? I already left the network on both of them.
Does anyone have a clue?

Link to Reddit