Freelancers: how do you decide a job is NOT worth applying to?

I’ve been noticing something while talking to freelancers:

Most freelancers don’t struggle with writing proposals.

They struggle before that:
– understanding what the client actually wants
– figuring out if the job is even worth it
– spotting red flags early

Some freelancers told me they spend hours just deciding this.

So now I’m trying to understand:

• What signals do you personally use to skip a job?

• Low budget? vague description? client history?

• What’s your biggest red flag that makes you skip a job?