But it would be vry dangerous to call it a domain. Many of these sites already carry authority, linking power and have a large amount of indexed pages, so it was possible that the builder domain is leveraging on that power only.Recently, it seems that domains belonging to web hosting companies that provide website builders are achieving extremely strong SEO performance.
They are ranking not only for low-competition keywords, but also for many highly competitive keywords as well.
Since this is somewhat similar to a parasite SEO approach, I do not think it will last forever. What are your thoughts on this?