When I spotted that they had Claimed a horse, I inquired about it because, if we were allowed to Claim horses, I would have asked my teammates to vote on horses to Claim, if we could afford it.
I can see why CW teams aren’t allowed to buy or sell horses, because the team captain could potentially put one of their rubbish horses (non-CW) up for sale and then buy it for his/her CW team, or, if their CW team had a horse that was doing well, the Captain could put it up for sale and then buy it for his/her actual stable. The other members of their team would probably protest these transactions, if they noticed, but, as we have just seen with the Claiming of Major Smackers (which was done in all good faith by Soylent’s Captain), it might not have been noticed.
As for Soylent being penalized for this, on the contrary. Major Smackers had an overall score of -5 CW points, which had been included in their total, even though those points were for races run before they Claimed him, so they will actually be 5 points better off.