Who really cares about the trueskill from bots.??
I only looked at them for the reason that they might reveal something about the Goko rating system (and possibly about Trueskill in the context of Dominion as well, even though the underlying mechanisms are known), out of academic interest as someone who has (very briefly) worked with designing such rating systems.
Potential under/overestimation of bot skill in Goko is also relevant from a meta game design perspective. While hardcore Dominion players might not care about the internal ranking in Goko, the leaderboard is an integral part of the product Goko is offering and non-negligible part of their customers play against bots frequently enough to be affected by such potential bias in their quest of playing the meta game of leaderboard climbing.
Edit: Also, if the bots would, for some reason, have biased estimates in Trueskill, playing against them could be used to game the system. You probably couldn't reach the very top that way, since they have so low skill, but maybe the average players could get a few extra levels that could matter for a contest amongst a group of friends?