free

 free  could refer to no charge, or freedom, as in the freedom to fork an open source project, and ship it yourself.

Unpredictable
If a service is free, that is, you're not paying for it, it lacks financial incentive to be around for you to use. The expectation is that site-death is more likely, and expected to be sooner, for free services, or that free services will eventually need revenue and change features or behaviors in order to get that.

Free to some who are the product for others
