Main reason cause it's the easiest to setup as it only need 2 containers.
Edit: Might create a specific team just for selfhosters where people from this lemmy community can talk about posts there, or generally about selfhosting
Edit 2: I have created "Casual selfhosters" team on my mattermost instance, will create a post either later today or tommorow promoting it, but for now will leave an invite link here so feel free to join in and talk about selfhosting!
[https://mm.cronyakatsuki.xyz/signup_user_complete/?id=trbsbo38c3bu7kqirx644wcqiw&md=link&sbr=fa](Invite link)