The Steam platform is designed to encourage users to use two-factor authentication. One of the community tasks (achievement-like objectives) on Steam is "Use the Steam Mobile App for two-factor authentication". This is visible on public profiles for anyone.
This could let possible hackers quickly find out whether an account uses two-factor authentication, letting them choose targets more efficiently.
Should people be concerned about this security risk? Should it be reported to Valve? Or is it harmless?
Doesn't this feature completely undermine the purpose of 2FA as hackers would simply avoid accounts with it and choose other accounts that are valuable targets without 2FA?