How would you approach it? Setting up a renderer with global coverage isn't really a trivial task. It is straightforward, and there are reasonable guides, like https://switch2osm.org/ , but the planet database is just a big database to work with.
(I think I would take advantage of Mapbox's free plan, which allows for 1 custom stylesheet and enough usage to get the image together. I guess there are lots of people who would be happy to render a stylesheet (especially if a modest fee is involved), but I'm not sure how someone on the street figures that out and gets in contact with them)
Yes, I setup a postgres instance a few weeks ago, so that I could render the local area with nik4.py. Lucky for me I already had mapnik and node installed and working, so getting CartoCSS and nik4.py running wasn't a big deal.
I was wondering if you had a specific setup in mind when you said 'just generate', as I did not find the process to be particularly trivial, even for a smaller region (and I do have experience messing around with arcane syntax and command lines).
(I think I would take advantage of Mapbox's free plan, which allows for 1 custom stylesheet and enough usage to get the image together. I guess there are lots of people who would be happy to render a stylesheet (especially if a modest fee is involved), but I'm not sure how someone on the street figures that out and gets in contact with them)