[saintfire]

It chooses the challenge weight based on signals. If your phone looks like a phone from a residential IP you get a simple challenge.

If you then spam requests you might get another, harder, hallenge appear.

If you have a data center IP and look like bot traffic you get a hard challenge out the gate.

AFAIU after looking at their docs several months ago.

[frollogaston]

Ah, knowing the type of IP is really advantageous by itself