Non-developers take advantage of it by hiring a developer; it's essentially the right to take your software to be serviced by someone other than the seller.
> Traditionally the FSF advocate will say something here about end users hiring developers to modify software for them, but in reality that’s economically ridiculous.
It's perhaps ridiculous for non-wealthy individual end-users for software that isn't integral to a profit-making business, but it's quite common for major open source projects to see most of their contributions being from institutional end-users who have hired developers to address their own needs with the software.
Why is it ridiculous?
Sure, for the far right of the bell curve, the “end users” who are owners of medium-sized businesses, it becomes viable. But I’m talking about the end users who buy Microsoft Office Home Edition.
Traditionally the FSF advocate will say something here about end users hiring developers to modify software for them, but in reality that’s economically ridiculous.