There are positive and negative flavors of what is called "stickiness".
- Positive: the user gets more value the more they use the product and so they don't want to leave it.
- Negative: the user gets more and more stuck and can't leave the product.
- Sometimes the two sides are related; as in a user storing more data in a system and building their workflows around it.
- The more they store data, the more useful the tool gets for them… and also the more that it would be a pain to migrate everything out.