If the site you're gambling at gives you a 30 loss streak in less than 1 million rolls it is rigged.
*facepalm* It is irrelevant the size of the losing streak - it does not prove that a casino is rigged, only that variance thus far has been a huge dick to you. To prove something is rigged you actually need to find a piece of code that is changing the outcome of your rolls such that you lose, until then the best you can say is that the site is extremely suspicious.
Yeah?
How about getting 30 loss streaks multiple times within a week (at 49.5%)? Would you consider that dice site rigged?
Better yet how about hitting a 34 loss streak out of 50 rolls?
Usually such streaks happen over a long period of time, but that long period could also be a short period, incase that streak happen initially in that seed.
even a 100 loss streak can happen