I guess you don't know its difference.

Free software means freedom and not the price. There are paid free software.

By defenition, free software is software that satisfy 4 essential freedoms

Freedom 0: Freedom to run the program any way you want on any of your devices

Freedom 1: To see and study how the program works and change it according to your needs. Source code of the entire program should be visible for this freedom

Freedom 2: Freedom to share copies of the original program(sharing is caring)

Freedom 3: Freedom to share copies of the modified version which you adapted to your needs such that whole community can benefit from your modifications

So yeah this is Free software, and when you say FOSS, its not about the price, but the freedom and control you get with the software. Why is this important? Because theese non-free softwares are taking away our freedom by even limiting "us" from using our "own" devices(DRM, locked bootloader, etc.), and it will be too late to realise how most proprietary softwares we use, and ones we are forced to use, captures our freedom.