I ran it randomly. I'm not concerned that someone will guess my private key with the intention of guessing "my" private key. I'm concerned about somebody stumbling upon my private key by running these softwares at scale (one instance can run 1 million combinations per second. If someone were to run 10,000 instances they will most likely come across keys which have bitcoin in them)
Is it still that random if you came across keys which someone has already swept? It definitely doesn't sound very random to me.
The key space is 2^256. Do the calculations for someone running 1 million instances of 1 million tries per second. How long would it take for someone to find a key assuming that there are 2 billion keys currently.
Rate: 1,000,000 * 1,000,000
Key space: 2^256
Number of keys: 2,000,000,000
Ps. That is still many many times of earth's existence.