BB5, 6 and 7 were all very nasty.
Even when they never used to intervene, they had to send security in during BB5 and if that happened today it would definitely be taken off air.
BB6 would have been too- they had bin throwing, squaring up, sprinkling scabs in food, water throwing, chasing, food chucked over people etc ... that wouldn't have been allowed to happen and almost everyone would have been removed from that series
I don't even think BB7 would have made it to day 2. They had 5 mentally ill people in that series- Shahbaz, Pete, Nikki, Lea and Sam and there was quite a big deal about it at the time. Post CBB5 and that would have been even worse.
BB9 was weak in comparison to those, everything was verbal. It was a fairly nasty series but nothing compared to how BB
has been.