So in my particular case I simply spin up a Linode or DO node when I will do something that will require hours of data processing. Maybe they are not the fastest options but at least lives my personal computer alone when processing.

There are also services that rent Macs or PCs with serious GPUs but I have no experience with those. AFAIK, for people who render 3D stuff there are render farms but I also don't have experience since it's not something I do professionally. When I render something that will take hours, I would ask for a remote desktop connection to my friends gaming PC.