They log every single button press you do, but they don't change odds on the machines in real time; that's illegal. When you setup a slot machine you have guard

They log every single button press you do, but they don't change odds on the machines in real time; that's illegal. When you setup a slot machine you have guards and cameras watching your every move. Software is validated with checksums before it is put into service. The exact settings you put in are in some states pre-approved by the local jursdiction for that machine for a certain time period (X years). Changing the odds of the machine is a ton of work.