If a large enough minority use FOSS-only systems, and support their development (with donations of money and/or effort) - that is enough to prop up sound and capable alternatives which gradually attract users.
Twenty years ago, it was rather difficult to suggest to clueless users to use a FOSS-based system. Today, it's quite realistic. Not everything is in an ideal state, but still.
I was reading you comment and the obsidian note taking app came to mind in regards to how supporting foss makes an impact over time. Look at valve supporting Linux and look where we're at today with Linux gaming. I think you're right It makes a difference over time. Look at all the gamers using the steam deck. They don't even know the platform is based on foss. And that in and of it self has the impart to change where we are headed. The masses don't really need to know what is happening. They just benefit from the supports of foss
thats why its really regulation who going to change this, and probably not any individual actions.