-snip
I don't know how the house edge is actually implemented at dice sites (anyone care to explain?)
-snip
It is very simple, the site just set your probability to win to make your EV always be (1- House edge %)*bet size.
For example if you are playing a x2 bet in a 0.5% edge site, you will win the bet if the roll is under 49.75. (1-0.5% = 49.75%*2)
But if you are playing in a 1% edge site, you will win the bet if the roll is under 49.5. (1-1% = 49.5%*2)
WTF, somehow I expected a good deal of black magic going underneath there! Therefore it won't be difficult at all to calculate the house edge as a function of time that has passed since the last bet. Regarding bots playing from different IP addresses and things like that, this is exactly what many faucets are fighting with on a day-by-day basis...
So, if you want your IP address banned and money taken, you're welcome!