Totally agree. Plus, the article didn't mention (and it shouldn't), whether she met her partner at Github or not. They may as well be a couple since college.

I'd prefer not to be in a relationship with a co-worker, since I fear, it would be more difficult to keep the job out of our personal life than visa versa. But, if I'm really attracted to a single co-worker more than physically, I'd just ask her out for a coffee or drink and happily deal with whatever positive or negative things might happen.

Not doing anything, just because you think its unprofessional or inappropriate is way more unreasonable in my opinion.