Ethereum has biggest blockchain development activity

According to the GitHub, Ethereum is leading cryptocurrency with more than 1,2 million changes in the code in last 7 days. Followed by Cardano (70,826), EOS (52,585), TRON (37,974). This big difference between other coins is presumably for the upcoming Metropolis Constantinople hard fork upgrade. This changes are only for protocol development. They are not including development of dapps on Ethereum, such as IDEX, CryptoKitties, DAI, BAT, Status and so on.