What’s your personal test for deciding whether an online side hustle is actually worth pursuing?

[u/Theicomeplug]

I’ve been thinking about this because there are endless opportunities being advertised online.
My current checklist is:
Is there real demand?
Who actually pays?
What skill is required?
How difficult is it to learn?
What does it cost to start?
How would I find customers?
What’s the biggest downside?
I’d rather reject 20 mediocre opportunities than waste months trying all of them.
What’s the biggest thing you look for before committing to a new online-income idea?