IIRC SolveMedia can be abused very easily by bots, or at least more than reCaptcha can. I think that reCaptcha is the best solution currently.
Technically,there are no solutions,just precautions.In the coming days,Google Captcha will be solved by the bots anyway.
The feature is good on the security side but makes the process irritating that you have to put captcha everytime you log out of the account.I wonder when is the new forum coming into practice if the developments are still continued on this one.