That's the idea - but most cafes (at least in Boston) can't handle that sort of volume - you're going to get stink eyes if you settle in for more than an hour or two. Wish it was more welcomed (as I've seen more common in Europe / small towns) to be welcome as long as they have seats.

Anti-cafes [1] sidestep this conflict by charging their visitors by the minute and offering unlimited tea, coffee and sweets while they stay there. It is, or it recently was, a hot non-technical business to run in many post-Soviet big cities.

[1] https://en.wikipedia.org/wiki/Anti-caf%C3%A9

Not every cafe will accept people working there.