I see perceived values as more of a multiplier. If an app had 0 value, 0 times anything is still 0. You can't take hostages over something with no value. If people didn't value their life it wouldn't work, similarly if people saw 0 value in an app they wouldn't use it.
>>charci+(OP)
My argument was about how value is decreasing. No one is arguing that these websites have zero value to begin with.
A more interesting thought experiment is where that threshold is before the lack of value invigorates the energy needed to migrate. That's part of why I put the boiling frog metaphor there. Rate of change definitely has impact on perceived value.