In fact the vast majority don't, as that's just too risky to most. ie $5/mo tier x 16 months = $80 only for a dev to possibly simply ghost everyone and not give them the update they expect, or come up with endless excuses for years on end until it's obvious to everyone but the most gullible. Most will cut their losses long before then, it's why the vast majority are every 3 months or maybe even monthly if it's a team of 3 or more working on it (30-60 min of content a month = almost no one even unsubs once subbed since there are no down months, sadly those devs are few and far between and are all boring vanilla AVNs like Daniels K's).