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Re:Advent of Code – solve a puzzle every day by tln on Saturday December 05, 2015 @01:22PM (#10682736)
It's totally acceptable to a lot of people. In fact I wouldn't be surprised if adding email registration reduced the conversion rate.

This adventofcode is a gem, you are really missing out if you let the registration system deter you.

Re:Advent of Code – solve a puzzle every day by such_a_casual on Saturday December 05, 2015 @01:23PM (#10682742)
Email registration is the same thing. There's no reason that anyone should be forced to connect an account from another site to this one. However, at least with email addresses, it's trivial to use a temporary one.
Re:Advent of Code – solve a puzzle every day by kryptiskt on Saturday December 05, 2015 @01:52PM (#10682849)
It's also trivial to get a throwaway reddit account.
Re:Advent of Code – solve a puzzle every day by maxerickson on Saturday December 05, 2015 @01:39PM (#10682802)
Force is the wrong word, the site has ~0 leverage over visitors.