Fundamentally, there two problems: fork() is a performance trick to try to do setup only once and seeding an RNG is a type of setup which isn’t intuitively obvious can’t be optimized that way; and if most people learn from a tutorial or quick start this is exactly the kind of important but non core issue people omit or ignore in that context.
Like, they think they're reading from /dev/random, but they're not: they're just running rand() (metaphorically speaking).
