Keeping hardware running 24/7 cheaply is difficult. Expanding an existing setup is expensive. Consumer grade ISP’s will block unexpected network protocols sometimes seemingly for no reason. Dynamic DNS isn’t super robust, so several times I went on vacation and the DNS service would flake. Maybe it’s better if you pay more for it, but I have no complaints about my VPS. It’s nice to be able to just reliably reach my web stuff and not worry a cat bumped the power cable.

It is possible to use a dynamic DNS service. They’re typically pretty cheap. I did for several years. It kind of sucked so I rented a VPS.

Free article, as long as you sign up with an email.

For me, the top right corner has a bubble for “layers” shaped like two overlapping squares. In it there’s a dropdown with a bubble marked “Places”. It gives you a crosshair you can use to mark the business and add details like what kind or opening hours.

I’ve had this issue before. My limited understanding is that your home server fetches copies of communities somebody on your server is subbed to. But if you’re the first person, it can take it a few hours to federate (took mine a day.)