There's another segment of people who can be sold snake oil. They aren't actually very sensitive to UI responsiveness, so they won't notice the extra latency added by the streaming service, but they will believe claims that it is "faster" than what they're currently using in some nebulous way. (These are the same kind of people who rewrite their app in React because they believe React makes apps faster.)
Yes, probably, but I would note that a cheap M1 Mac is 4x the annual cost you cited for the browser, and if the browser is 95% of what you use a laptop for, getting the same perf boost for 25% the cost sounds like a good value prop.
Granted, a laptop should last more than a year, but presumably it starts to show it's age in under four, whereas the remote browser can improve over time.
I don't really see how I could justify paying 20-25% of the price of my laptop per year, that I use for much more than just browsing, to have a faster browsing experience. And I'm a power user (SWE, etc.) compared to the mainstream consumer, the market for this product seems to be extremely niche/small.
I think baas is bullshit for security reasons alone.
Some people do all their work in browsers.