[danjac]

You can totally do this (within the bounds of your contract) but from a career point of view, it's not wise to burn bridges.

There's a lot of talk about "networking" to find jobs or opportunities (like your own startup or freelancing) but one thing networking means is building relationships with people you have worked with in the past. That doesn't mean sucking up, but just being known to be reliable and dependable makes you a safer bet if that person is in a position to hire or recommend you.

That manager or coworker you did a project with a few years ago might have moved on to another company and is someone you can reach out to. If you dropped out of a project mid-way without cause leaving them in the lurch, that's something they are going to remember.

Sometimes of course a job or project can be a nightmare and you want to have nothing to do with those people ever again, which is understandable. But otherwise I would try to be professional as possible and leave options open, and if that means giving your notice and coasting a few weeks, then do so.