My whole family, except me, are architects (I am the black, nerdy sheep). I have also studied first year of architecture.
From what I have gathered, from the two companies of my family members, are that such services are in high demand, BUT at a much too low price that I would bother. doing it
They actually use services like these often, but they outsource it to low cost countries.
In Norway, where we live, the prices are very high, and so are the salaries, so there is really no way for me to compete with these guys, unless I am willing to go way below the national minimum wage, when all taxes and expenses are paid.
Therefore, I have given up on the freelance 3D idea…
If you live in a low cost country and are willing to work internationally, the business should be “booming”, though.
EDIT: I actually remember my parents rendering **** like the archviz (some .mov files with vr) in an app called Jonathan in the mid-90s. They had to leave the mac on for over a weekend to render a small apartment in half-life (1) quality…