Every guide, comparison and detector run we have published under sdk.
109 accounts, 1,989 logged actions, zero interactive challenges and zero re-logins across 32 warm-up sessions. The harness, the code, the per-batch variance, and what the free tier actually covers.
A script that opens one browser per task creates one profile per task, and every tool that lists profiles then has to list them forever. Temporary profiles go in a separate tree the desktop app never reads, and nothing in it is deleted for you, which is the point.
A launch that jumps to the front is fine once and unusable in a loop, and going headless to avoid it changes what the page can measure. There is a third option: keep a real, normally sized, visible window and stop only the part that interrupts you.
A loop that opens 400 browsers should not decide that you now have 400 cloud profiles. The sync option has three states rather than two, and the difference between the default and an explicit false is the part worth understanding.