Monero had more of an instamine than Boolberry, just see
http://monerochain.info/charts/difficulty. Claymore likely mined with his GPU miner before he released it with a 5% fee. cbuchner1 also has mined Monero with a private gpu miner on EC2.
There was no instamine;
http://monerochain.info/charts/coinsInstamine implies massive inflation in the beginning where a small group of individuals gets all the coins. Inflation is still so high that anyone is welcome to bring miners on the network and get paid large amounts of XMR.
Correct. The term instamine does not apply to either BBR or XMR.
The real "instamines" are when you have, e.g., broken difficulty adjustment algorithms that allow a significant fraction of the coin to be mined before others are aware it exists.
e.g., the quote about Darkcoin, "That means in less than 8 hours, almost 5% of the Darkcoins that ever will be created spawned in that 1/3 of a day." (source:
http://www.devtome.com/doku.php?id=a_massive_investigation_of_instamines_and_fastmines_for_the_top_alt_coins#darkcoin ). An instamine is a violation of the advertised or planned emission rate for the coin.
In contrast, what happened with both XMR and BBR is closer to what happened to Bitcoin: The initial distribution of mining hashrate was uneven, and several individuals were able to mine at a cost advantage relative to others, when they used a technological advantage to do so. This happens to most coins, and evens out over time. Heck - for the first few weeks of XMR, almost nobody knew it existed, and all of those early adopters probably got in at a great price.
There's a huge difference: I believe Tacotime and Zoidberg more than I believe the Darkcoin story, because in neither of these cases, as far as we know, did the people responsible for the coin lie about what was going on and/or profit. An instamine or secret pre-mine, on the other hand, suggests that either the developer is incompetent, or dishonest.
I'm not sure what I'd call BCN, because it depends whether you believe that it existed "in the shadows" for two years, or whether the developers used the deliberately slowed down miner to fake two years of a blockchain in less time. I personally believe the latter, but I have no concrete evidence of it, just a hunch based upon how slowed the mining process was.
cbuchner1 is right: Coins *should* be released with fast CPU and GPU miners in the future, because when a coin with a new PoW is released, we already know exactly what will happen...