Was a story a few years ago about someone who reverse engineered the software and found the machines are programmed to give a win after a certain amount of plays.
That's a bit of a crude approach, but I'm sure it happens. It's generally a bit more subtle, involving deliberate variations in grip strength. Either way, the point is to average out to a percentage in terms of money in and money out. If each toy costs X, on average it's going to cost >X to get one and the machine
will be set up to make that happen. It's gambling. It's rigged in favour of the house. That's what gambling is for.
This person is an arse. She wasted far too much money to get a cuddly toy for herself and then did it again right away despite knowing the score, then tried to use a baby as leverage to absolve herself of responsibility for her own actions. The baby didn't care - she even says that herself.
It's even more dumb today because it's so easy to buy the cuddly toys. You don't need to spend time and money travelling to shops - just go online and buy the toy. I bet she could have bought it for <£10 delivered.