for example when doge reached 4-5 GH network, back in december-january, when there were only gpu mining it, even a single dude with 200gpu, can reach only 200Mh/s, and that's is just 1/40 of the total hash
this is just an example why gpu lead to decentralization, asic instead....
that's horrible a government or other entity could easily 51% that , a high hashrate is a great thing .