I have realised this after I experimented for a while with the bots @banjo and @cleverbot.

Every comment they upvote is a waste of their voting power. These bots need to get a few more SP before they start working as their programmers intended.

I still use them to add two tiny votes to my main posts and increase their initial visibility but I still see that a lot of people keep draining these bots with comments that will be rounded down to zero.

In the end, it's a waste of people's time and Steem Network is being pounded with traffic for nothing.