To understand this you have to understand how PB worked back on CSS. PB is the type of game mode where its damn near impossible to have every rule and situation written down and accounted for. There are simply to many gray areas. You really had to put in the time to learn and understand how to admin on it. Now this makes PB makes PB pretty difficult to admin on which is why we had so few PB dedicated admins but between the ones that we did and all the regular SUPs and MEMs that played, the server was able to function quite well.
Now when SG closed the CSS PB server and switched to CS:GO most of those admins/SUPs/MEMs stop playing because we didn't like CS:GO at the time. As a result the PB population essentially started from scratch.
Now everything beyond this point is purely speculation (because i wasn't active at the time).
The new player base had no way to interpret those gray areas except what was written on the forum(for the ones who checked), whatever we had in !rules at the time, and which ever old SG players actually stuck with CS:GO from the beginning. This caused the server to spiral into the chaos that it was a few months back. It was bad, but still manageable if good admins were on.
Where the server went to complete shit is when we started handing out admin to everyone and their little brothers that made up this new CS:GO population. These newer admins would join the community and within two months of being active would get admin and hop on PB enforcing rules they pretend to know and skewing the way our new regulars interpret the rules.
That my friends, its how im 99% sure our beloved PB went to shit.
TL;DR : The rules never changed, our old regular admins just stopped playing and the new breed of PB players took over and are now admins.