Monero was mined by its creators for months with highly optimized miners. They claimed that the original devs instantly dumped these coins as they were mined. So technically there was not a premine or a fast instamine. The devs were only in it to make money. I think it was roughly 5% of the supply. At that time it was over $100,000 they stole from miners. Its ok though. There was a community take over. That wipes the scam slate clean.
This is somewhat confused (combines a bunch of different things in a mixed up way), but off topic here. If you want to discuss Monero you are welcome to ask for the actual history on the Monero thread.