You should care! To wit, the Proprietary software you use is better for having to compete with Free software. Free software's 'users are the customers' mindset

You should care! To wit, the Proprietary software you use is better for having to compete with Free software. Free software's 'users are the customers' mindset competes with the 'users are the product' trope that proprietary software can get quagmired in. Even if the Free software version is a smaller community, the mere fact that a user-centric alternative exists can help prevent this.