[Maru]

The BB brand brings more attention to their channel, so we will probably see more ITV-adjacent personalities (mostly reality people probably) and that may just mean the drama is more pre-produced based on things that happen just before entering the house... They could take someone controversial from popular show X and throw them in with other very controversial and attention-seeking neurotics from popular show Y and let it rip... it's not the original spirit of BB, but it's also just so hard to find "normal" people to throw in there that haven't already been touched by media and made some links to that industry.

I can see it being very hard to avoid recycling the same reality TV people across the spectrum/multiple programs. The reality TV industry is very incestuous. As such, they probably get a lot of interest from people who are creatively active, but because they already know what they will get from them, especially if they're seasoned in whatever douchebaggery they specialize in, it's not a good fit for what BB is meant to be: a social experiment. It's not meant to just be a house for people to just come in and shout at cameras so their faces will be plastered everywhere. Maybe they risk annoying and scaring off the audience if they cast mostly these kinds of publicity-greedy personalities. (They would want people to understand and actually play the game for it to really work)