Automatic comments on PSR-2 violations

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I've seen a few products coming out of the woodwork that combat this lately, unfortunately though, none have had a free option (not even a trial) so it's not something I can introduce to my team. I may be a little off the mark here but whats the difference between this and something like rubocop? I can set that up for no cost and have my CI fail if it doesn't pass the requirements.