It doesn't really matter whether it's a browser or not - what matters is the value it provides. I pay $15/mo for netflix even though I get some amount of free cable tv from my ISP. Google Analytics is free, but I use a paid competitor that I prefer more. There are a ton of free email clients, but I used a paid one because it has features I can't get in the free ones. None of those are "selling ice to an eskimo."
Likewise, there's nothing inherent to browsers that mean they always need to be free, just because the dominant ones currently are.
Now, that said, I don't think this product is worth anywhere near $15/mo to me, but maybe that'll change over time. A browser that actually makes me significantly faster at my work vs chrome/etc could easily be worth that much to me.
Same boat. I have no problem with the price if it provides value for that price. Currently I'm paying:
$10/month for Spotify because it's easier than maintaining my own music library and syncing it across devices.
$10/month for Lightroom and Photoshop because it's vastly better than its competition
I just don't see how this is /that/ much better than the competition (Firefox + extensions) or makes my life easier in any significant way.
At current prices, for $15/month you need to provide some serious value because most people will do the direct comparison to other subscriptions they are familiar with.
Likewise, there's nothing inherent to browsers that mean they always need to be free, just because the dominant ones currently are.
Now, that said, I don't think this product is worth anywhere near $15/mo to me, but maybe that'll change over time. A browser that actually makes me significantly faster at my work vs chrome/etc could easily be worth that much to me.