I second this.
I've also noticed that bots always fill fields based upon their name attribute, so call your fields something other than "email" and "username" and reject submissions where fld9624-v2 is not a valid email address.
I've also noticed that bots always fill fields based upon their name attribute, so call your fields something other than "email" and "username" and reject submissions where fld9624-v2 is not a valid email address.
Remember, you don't need a perfect solution to this. When you and another person are being chased by a tiger, you don't need to outrun the tiger, just outrun the other guy.