Minecraft server: disable certain mobs?

A few days ago I got a Minecraft server together with friends where we wanted to build a world in survival. However, pillagers are constantly spawning and it is impossible to drive them away or kill them without directly triggering complex raids.

My question: Can you configure the server / the world in such a way that a certain Mobart can't / does not exist?

I don't think there's any way without a plugin. However, you could build a clock with a command block, with the command to kill a certain entity. This command is then carried out every second, and ensures that these no longer spawn.

Disadvantage: The server performance could suffer a little.

Unfortunately, you can only deactivate the pillager patrols; unfortunately, certain months can't spawn

Make a farm at Pillager Outpost, then they won't come to you and drop you crazy stuff

You can only deactivate mobs with plugins

But you can also do it as picasso22 writes