You're misunderstanding the point of the proposal. These bots WON'T earn rewards, and are purely for matchmaking and liquidity.
Bad bots earn rewards. Good bots play for free when there aren't humans to play, and don't earn even if they win. This proposal introduces the latter.
"The bots won't earn the reward" is not an important point in my opinion. With the ghost cards, Splinterlands is not the NFT game anymore and this is the bigger problem that you should consider before implementing this proposal.