It is not matter of "brand", it is matter if what it was on the same domain name the years before, if unique content or whitelabel/cloned content.
You can check this with archive.org , which shows site copies in the past.
See freecamstars in 2012 it wa a completely custom, unique cam site:
https://web.archive.org/web/20121024...ecamstars.com/
Then later switched to streamate WL. But google does an average with the past, and some of the authority/uniqueness of the past will hold for a while.
I seen same behaviour for livebucks sites converted in streamate, these stay upper still now in results.