Majority of the ISP's provide dynamic IP these days and getting static ip costs significantly more money. If you have a low compute device like raspberry pi run

Majority of the ISP's provide dynamic IP these days and getting static ip costs significantly more money. If you have a low compute device like raspberry pi running 24/7 which controls all the home network, then connecting(ssh) to it over internet requires static ip. The other alternative which does not cost money is setting up tor(which is pretty simple) and ssh socks proxy on the client machines. This use case is pretty common which does not involve privacy but very useful.