The .02% was a typo right? It would 2%. I'm not sure you can figure this out from coinmarket cap. Safer bet would be looking at the hashrate on Nicehash and take part of that. The only big ASIC alt-coin right now is Litecoin, so you can exclude that.
All the cryptos are in the shitter right now. Pretty much everything is going negative at this point. Things like Nicehash don't take into account big farms running private pools as well.
I wouldn't be worried about people ripping off the miner, there are ways of dealing with that, but they take time and money. Encryption, authentication, and verification. Those are just the brute force methods too.
A startup isn't something that makes big money. It's something that gets off the ground. Half a million per year in revenue is enough for a small company employing like 10 people with pretty decent wages. I was originally looking at something like 5-7 people as well. Guess coinmarket math is another way of looking at it.
Scrypt and sha256 based coins are all asic now. Single algo coins like whirlpoolx, blake, keccak are all FPGA. and then we have a few algos left. The biggest problem with a 2% miner is that it has to be the fastest in the world at all times. This is very difficult. People like DJM34 and wolf0 could easily add a few percent to most of the algos out there. Close the source and be a competetor, and then we will be out of business..