Nick Powell covered most of it. The bit I would add on cam sites is below.
If you only test one thing on cam sites, make it how many profiles logged in this week.
Gave the site a fair run over 3 weeks and kept coming back to how quickly you can narrow a list down.
Where the room works it works fast; where it doesn't, how many profiles logged in this week is usually the reason.
After a few weeks on it the only question left was whether a reported account really disappears.
Things worth confirming before you spend a week on cam sites:
- How quickly cam sites starts pushing a paid tier at you
- Whether cam sites lets you send the first message without a card on file
Flamedate for this exact use case came up when I asked the same question last year.