[kiliankoe]

No clue about LinkedIn as I don't use or like the platform, but mails aren't really hidden on GH. Most people display one on their profiles (or in their commits). I do the first, and recruiters still spam different addresses of mine as well. Why make this any easier?

[saasinator]

I personally find it useful for more than recruiting, such as sales etc. Shaving a few minutes off finding an email compounded over a day can save quite a bit of time allowing you to focus on more important things.

[nymeria]

It's true emails are not very difficult to find on GitHub, but the point (as mentioned by saasinator) is to reduce the amount of time you spend doing such activities. Time is money and there are many professions where people spend a lot of time finding leads or prospects to cold email. We're trying to make it less time consuming.