GRS uses proof of work which is mining through gpu and has a algorithm called Groestl which is already a new mining algo
Groestl is very old mining algo.
how old is 2014 to you and why should they come up with new algorithm just for fun? or perhaps you think making an algorithm is like typing on a notepad and voila? to make an algorithm is extremely difficult only computer scientist have been able to do so. check this link
https://en.wikipedia.org/wiki/Grostl if you have time just look at the profiles of the ones who created groestl cryptography.
Groestl algo came in 2014 which is even after scrypt and other protocols. Many coins like ripple ,monero, ethereum came around in 2014 with the new algorithm why should they come up with a another algo when this is already working and has lightning network implemented with so many wallets and protocols?
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Groestl is similar to brand like versace , giovani etc..
only few coins have been able to get on the mainnet of lightning network one of them is Groestl
https://bitcointalk.org/index.php?topic=1891745.0This is faster then other algo like monero , ethereum, nem etc ...