A first-generation PRNG formula could be broken with a sufficient amount of past drawings. I'm sure no lottery today uses this cheap system, but that was what a RNG used to be, many years ago (like 1980's technology). Start with one seed, generate a number, then generate another number when one is needed, etc. Never seed it again and never generate a number when it's not needed.
Any modern computer, even your smart phone, has the capability to generate numbers unpredictably. Re-seed the RNG using the current system time, generate numbers as fast as possible (many thousands of times a second), and use the one number generated when the operator hits the button "go". Need a second number? Generate another number when the operate hits "go" again. That would be thousands of numbers later. All those numbers between requests are generated and thrown away, and as a result, there is no way to reverse engineer the formula. In addition, it gets re-seeded with the current system time for every game, and there is no way to know in advance what the exact system time will be for the next game if it is operated by a person.
This is how slot machines operate. There are millions more data points from slots nationwide than there is in RNG state lotteries, yet no one has been able to crack them, and they never will because of the above explanation. Every slot machine RNG generates numbers thousands of times a second and only uses one when a player hits "go" (or spin, or draw, whatever label is on the button), plus they re-seed themselves every now and then.
It is the unknown (effectively random) amount of time between drawings of numbers (slots or RNG lottery draws) that makes it impossible to reverse engineer them. Even if you knew what the seed value is and the formula, as long as a person has to physically press a button and the computer can generate thousands of numbers a second, you'll never know what the outcome of the next drawing will be.
True or quantum RNG are good for state lotteries because people can still screw up a software RNG (like Eddie Tipton, and all the unintentional screwups that lotteries do like the DC pick 3 recently). They are more expensive than software but one state lottery only has one drawing machine, not thousands of slot machines running 24/7. In addition, slot machines are operated by the players, not casino employees, making it even harder to cheat.