From the rules: https://treeofsavior.com/page/common/?t=ts
You need to report any game errors, bugs and other game play issues to IMC Games. You shall not abuse them for your own benefits nor to cause grievances to others, and pass this information to others who may abuse them for their benefits.
Players need to attack once a in a while in order to keep their summons active (aside from the current respawn of zombies mechanics). The need to attack is intended to prevent players from being able to farm while being AFK for long periods of time.
Zombies using independent timers to track the last attack of the player is an oversight by the programmers of the game as it combined with zombify allows new zombies to be spawned with new timers that allow the player to have a horde of zombies active without any player input for long periods of time. This is a game error/bug and it is being abused by those that AFK farm for long periods of time by using bokor zombify. The abuse directly results in an unfair silver advantage for the AFK player as they are gaining silver through means unavailable to a fair player.
There are only 5 channels of Baubas cave and only 2 spots with no ranged mobs, the stone golem area and the area south east. The south east area is also worse than the golem area due to needing higher accuracy to hit monsters as well as having faster monsters. This means there is very limited number of places for a player to efficiently and enjoyably play the game.
By AFKing for long periods of time the AFKer deprives other players of the opportunity to play the game without disruption as the AFK player’s zombies will attack monsters that an active player is trying to gather in addition to already taking up the spawn of the monsters in the limited space available. The abuse indirectly causes grievances to others.
Part of the summoner play style is to have the AI do the work for you, but please bear in mind there is a difference between AFKing for a minute, as the developers intended, and AFKing for hours.