Artist that try to avoid pixels, will work with a larger canvas, the when zooming in the quality might be very blurry. A pixel artist doing nice prints would show details all the way down to the pixels, and their art will show great at 100 dpi with the other is a question of how the quality looks at 300 dpi.
This website has printing service, and without using it, some can say I want that printed up, and they will, then they might give the artist 25%. With a print account the artist gets 50% of the sale. This makes it a risk if you think people really want to buy your art, but from what I see it is rare for anyone to want a print, but the artist for themselves, or sell them in a locally. People might not buy it if it is not ready to be taken home.
I had 2 prints done on canvas for $50, and I stretched them on frames and framed them for sale. While the covid-19 is slowing things down, I don't think anyone has even seen them on display.