Just read the posts and comments about Izzy not seeing her dad and the suggestion from an old Gossip Guru post that bio dad may be abusive. If a parent is alleged to be abusive, it's just not the case that Sarah goes to court and gets access stopped. I experienced similar with a friend and her girls' dad. Social Services became involved, the children were interviewed, reports were written for court, dad can be assessed too and he can be assessed with a monitored meeting with Izzy (unless its too emotionally harmful for the child). It takes months and months of filling in paperwork, interviews, court hearings, parental courses etc. It ends up affecting all areas of your life, surely someone would have picked up that something was going on behind the scenes when they were vlogging. Izzy's dad would have had done a lot to prevent her dad from seeing Izzy. The courts stopped the father I know from seeing his daughters, he was an abusive drunk who tried to kill mum. If Izzy was aged over 10 at the time her decision would have had a big impact, but along with everything I mentioned above. My friends girls were really affected by it all and you could tell. Just by looking at them.
I think it's more Sarah has taken dad to court to sort access rights (just simply who has Izzy when) using a solicitor. Then bio dad felt he couldn't fight her as he couldn't afford legal representation and didn't feel he could self represent. Then if he's ever asked for access, Sarah just mentions court. The wealthy parent can use the whole court process to their benefit and it puts off those who had little or no money from fighting.