The bots usually play en masse at certain hours, that way they play with each other frecuently allowing them to go up in the clasification, and with some ordinary players. You can see that they usually play with a list of one splinter which is always the same, only cut by the mana cap (if the mana cap is 18 Silvershield knight-Divine Healer-Peacebringer-Air elemental) If it's lower they cut the Air elemental and so on.
Of course they do get cards like everyone else, except that they don't invest time nor money in it, a bot can play like this all day long and obtain a lot of rewards for their user, if there are more cards because of this the cards will devaluate at a higher rate, because of the absence of scarcity.
And if a bot is capable to go higher in the ranking obviously some regular players go lower, so they have impact also in the clasification of ordinary players, of course there is also a benefit for some players, if you know that the bots are playing, you can go up in ranking by playing at the same time, they are easy rivals.
Anyways, the problem is that isn't very fair to have very interesting profits for only having a program to cheat the system, this game is developed for real players not for an army of bots, and the change done by the SM team in this season was in this direction, I suppose that they might think something similar as I do when they're trying to stop this situation. That's my pov, but I'm interested in reading other opinions, so explain your arguments if you feel comfortable to do it mate!. Cheers and thanks for participating.