come on, setting up your own DNS is not difficult at all. For my home network, it’s running in a Raspberry Pi, but before that I ran it locally on my desktop. There’s no way I’d spend 15$ a year to resolve internal addresses.
Sure, you have to be careful with the TLD you choose, but I believe that if the ICANN were to create the .lan TLD, it would be all over the internet first.
I’m sorry, but why is this in the Linux community?
sure, Nextcloud is open source, so go and post it in the open source community or in self-hosting.