There are coins like Quark that use a mix of different algorithms and coins like Myriadcoin and Saffroncoin that use a chain with multiple algorithms. Myriadcoin and its clones are probably better described as being ASIC-tolerant since its co-existing PoW systems are able to accommodate CPU mining, GPU mining, and ASIC mining at the same time.
So my question is, why did coins which were focused on being the next Litecoin (which is essentially what these coins are/were) end up failing?
Litecoin had a similar role from 2012-2014 when it was able to carve out a niche for itself as a GPU-resistant coin when Bitcoin was dominated by GPUs and then as an ASIC-resistant coin when Bitcoin was dominated by ASICs. Once Litecoin's scrypt algorithm had its own GPU miners and then ASICs developed for it, you would think that coins like Quark and Myriadcoin would fill in the gap that was left behind.
A quick look at Myriadcoin's market cap on CMC shows that it is at $40,000, while Quark is looking a bit better at $600,000. However, that's still a huge drop compared with their ATHs ($700,000 and $50 million respectively).
A lot of people have said that when scrypt ASICs were developed, Litecoin should have changed their algorithm to stay one step ahead. But the failure of coins like Quark, Myriadcoin, and Saffroncoin shows that this might not have been the case.
(Also, I understand that Darkcoin/DASH with its X11 algorithm is apparently based on Quark's algorithm and also uses a mix of different algorithms rolled into one but DRK/DASH doesn't count since its main selling point is anonymity and thus it occupies a completely different and unrelated niche.)
The ATH of Quark was due to a bunch of people "having" to buy in to try to kill it afterwards.
of course that all failed so all things being equal take that "attack" vector out and Quark has had a nice steady rise.
all that occurred was it got a bunch of attention, it is now a permanent member of the cryptocurrency of this planet.
Scams of course will come and go - a real goo indication of what is a "real" crypto was what was recently purchased when "someone" recently broadly had "buy in" to alts.