[9question1]

You underestimate the laziness of most humans. To be clear, screenshots are still not trustworthy. But the "negligible" relatively more effort could matter in practice.

Cryptography sometimes seem to rely on a stronger version this too. With enough computing power, you can brute force a lot. Some authentication seems just expensive enough that only a nation-state actor would have enough resources to break it, and then rests on the assumption that the small subset of people who could put in enough effort won't care enough to do anything worth being concerned about.

This is also why, say, people lock their doors even if they have windows.

[londons_explore]

I think a good chunk of non-tech people in my social circles would be appalled that such sites exist, and assume that running them would be illegal.

[BobaFloutist]

I mean you can buy lockpicks online and learn how to open almost any lock on YouTube, but we still lock our doors.