if one account is surrendered to more than the typical deviation it should get blocked

This would be the more centralised approach. I think the win trading is less of a problem than the card ownership and battle history analysis of which bots are capable.
Within a fraction of a second, a bot can discern which team I'm least capable of countering.
Any time information confers a competitive advantage on bots, we should obscure it wherever possible.

I appreciate your passion for the game.