Two times recently I wanted to express thanks (or just ask a question) and couldn't. In both cases there was no way to message the person via GitHub because they'd not publically shared their email address. In one case there was no way to open an 'issue'. And in the other, it wasn't relating to a repo, but a really excellent tutorial.

In the olden times, we all just used email all the time for everything. It would've been bizarre for someone to work in open source and not have their email publically available. The funny thing is, I haven't shared my email on my GitHub either! I'm going to fix that today.