If you think the only topics of conversation we need are Politics, World News, & Technology, then we don’t need more people here.
Personally, I don’t like having to keep going back to Reddit for everything else. For other communities to be successful on Lemmy, we need about 2 orders of magnitude more users.
Are you content to have meaningful activity in just a small handful of generic topics? I’m not.
So, yes, we really do need more people here. A LOT more.
Are you just talking about dynamic DNS services for one or a few home servers?
There’s always DynDNS, but that’s a paid service. I actually discovered that dynamic IP address service was provided free by Google when using Google Domains as the registrar, so I moved a few of my private domains over to Google several years ago to save myself $55 a year.
Unfortunately, Google Domains is shutting down and all registrar services and existing customer domains are getting moved to squarespace and I’ve not yet been able to determine if squarespace is going to be offering the free dynamic DNS service or not.