The bot plays some card really badly, even using silverfish.

Example: Archmage Anthonidas. When bot has 7 or more mana, it plays Anthonidas alone, having it 100% of the times killed without using him. Bot should at least have another playable spell to obtain at least 1 fireball. Playing it this way make is impossible to use Tempo mage decks like the top 1 legend deck used not long ago.

other cards are used so randomly that players notice immediately there is a bot against them. the risk of being reported is really high.
example: warrior bot with arcanite reaper that wastes +4 attack to kill a 3 life minion (dealing this way 9 damage).

wasting spells without even saying "Ooops" is too suspicious. this kind of stupid errors should never be made.