It helps if you can treat it as a hobby. My partner’s hobby is music, which is a perfectly sensible thing to do in one’s spare time. I always feel a bit weird when people ask me what I do in my own spare time and my answer is basically fixing my shit, then pushing it just hard enough that it breaks again.
To your question, the unfortunate reality is that those of us who care about privacy and software freedom are a small minority. Why overhaul your business model to suit us when they can continue to milk every other consumer out there who frankly doesn’t give a shit?
Phones are, of course, the worst of all for this. People do great work developing FOSS solutions but it is an uphill struggle and I worry that the hill is getting steeper.
I tend to use floating or fullscreen for general browsing but often you have to type something while frequently referring back to something else - for example when programming I will be looking at the documentation. Or maybe debugging something on the command line while looking at your code to see what’s going on. In those circumstances tilling is perfect.