newfhouse
pleb
Self-employed can simply withdraw their labour, just like everyone else. The difference is that they lose out personally, so they don't because they aren't stupid.
If you are self employed you are likely to price your product or service according to what the market is willing to pay. If you can’t make a profit at that price you will have to either walk away, find different customers, or make changes to your business. This is not striking in any meaningful sense.