If not paying with money there are still other prices to pay.
Change, even if it's just the change to add, use or own something new, can have a physical, emotional or mental cost.
An app can be free, but it takes time to install plus mental effort to understand and use.
An update can be free, but if it takes time to install that's a cost. If I need help to learn the changes that's a cost. If I need someone to help me with a problem, either during or after the update then that has a cost. If there's concern about what might be different after an update is installed then there's a mental cost in the uncertainty (fear).