Pillager outposts spawn pillagers continuously, which makes them both a raid-farm site and a reason to build somewhere else. The map shows where they are, so the choice is yours instead of a surprise.

• A captain drops the Bad Omen effect — walking into a village with it triggers a raid, which is how you farm raid loot on purpose.
• Outposts often generate near villages; a seed with both close together is a strong raid-farming start.