The most effective way for coffee shops/cafes to discourage people working for long periods without driving that business away altogether is to not provide any

The most effective way for coffee shops/cafes to discourage people working for long periods without driving that business away altogether is to not provide any outlets! A cafe I like to work at takes that approach and it seems to do well for them. Most of their customers are there for coffee/food and conversation. I am mostly an anomaly for doing work there.