[octo_t]

Whats the harm? At most, people can encrypt things with your public key and then...?

[stared]

For example they can identify my different accounts, when I sue the same key.

[automatthew]

Last time I tried to use the same public key for a second account, GitHub refused.

[thu]

I'd say that at most it forces you a bit more (if that was necessary) to check the SSH fingerprint of the machines you're SSHing into.