Fact is that with this broad definition of instamine a lot of cryptocurrencies fall under it, including Bitcoin, Monero and Dash.
So its really a useless and dumb argument to use against each other.
1. Monero and Bitcoin are off topic to this thread. Please try to stay on topic.
2. If the definition fits every coin (which any definition that equates to "unfair mining" certainly does) then it is a meaningless definition and should not be used. The correct definition of instamine is when a large to very large number of coins are mined at launch despite the planned and documented distribution schedule being much slower. (If planned and documented, a very fast distribution at launch is a fastmine not an instamine.) By this correct definition for example, Litecoin had a small instamine (around 1% of current coins). Bitcoin and Monero did not.