Lock-in usually just refers to a situation where switching costs are (perceived to be) higher than the net benefit, within some reasonable payoff period. It can include things like high cost to extract data, but it can also include things like network/social effects.
The latter is a huge reason companies strive to establish "platforms" and suites of connected apps - even if competition is cheaper/better in a vacuum, it still may not be worth the effort to switch if you're already established within an ecosystem. The goal is vendor lock-in even if they're not holding your data hostage (though they might do that too).
Yeah, I agree with that. I didn’t mean to imply that it had to be impossible to move your data.
However, I do think that it has to mean something besides “there are no other good providers of a service”. Integrations, platforms, etc make sense as being “locked in”, but not “no one else provides the service”
To me, the key would be, “if you were starting from scratch and weren’t using any service at all, would you choose a different one than what you actually currently use?”
If the answer is “I would still choose the one I am using”, then I don’t think that is locked in.