That is a very valid point. The creation of Products that "require" continued use in the interest of (so called) continued good health is nothing new to the Pharmaceutical Industries. Read the fine print (really fine print) on the tiny hand-out included with most prescribed drugs and you will see what I mean. Most of them point out dangerous and undesirable results if you DISCONTINUE the medication.
The Internet Marketing Industry grabbed that concept and introduced it as a New Concept... called Forced Continuity, LOL.