Apart from the fact that is bad that Epic Store or any other software shouldn’t collect information from your HDD that isn’t directly tied to that software, we also should ask the software developers to be more proactive in securing the data in the first place.
You cannot trust any other third party utility, hoping they all will be good guys. You never know if this text editor or that music program or this innocuous strategy game is going to do the same. And because you can never know, the data should be encrypted, unreadable to any third parties.