I'd say in one case it's a strategic corporate tactic: you intentionally build something to attract people with the understanding that you'll slowly boil and eventually gouge them if you're successful, peeling away freedoms and adding fees in some form.
In the other case, it seems like something is a victim of its own success. A product or service becomes so successful it draws attention of the lifeless leeches of society who swoop in to try and acquire and/or exploit it knowing there's opportunity there. There was no strategic plan to do this (other than the fact all leeches are drawn to blood as an inevitability). Also, in many cases, exploitation occurs from user space: we don't own this thing, only have the abilities of everyone else using this thing, but there's a lot of potential money there so how do we grab some?
In the other case, it seems like something is a victim of its own success. A product or service becomes so successful it draws attention of the lifeless leeches of society who swoop in to try and acquire and/or exploit it knowing there's opportunity there. There was no strategic plan to do this (other than the fact all leeches are drawn to blood as an inevitability). Also, in many cases, exploitation occurs from user space: we don't own this thing, only have the abilities of everyone else using this thing, but there's a lot of potential money there so how do we grab some?