I remember a bad freelance experience.

It was a sophisticated mobile applications (many UI, many customization, many APIs to integrate with). since the client have many future freelance projects, I give him 3 weeks as estimation time, and one day per week I work on its place to evaluate the progress and sync our work.

I worked hard, the quality was excellent.. but he kept ask for "small" changes and "small" features.. at first it was OK, and I was planning to give him a good example to profit from his future projects.. but he toke advantage for that and the same app extended from 3 weeks to 2 months and more.. he barely added a little to the initial price..

So what I did? I uploaded the code to a private repository in Bitbucket, added him to the team.. I wrote few lines how to sign and publish the app.. aand disappeared.
his luck, I disappeared from the country, I immigrated to another country for best job opportunity.