That's not true for everyone, but it seems like it's the rule rather than the exception.
My point being that you're not just asking me to fix a to-do item, you're asking me to recreate your dev environment locally, research your codebase (to isolate the bug and figure out a fix), and then actually fix it. And if this takes more than a few hours, I may not have time to do it whether you pay me or not. Like I said, I'm looking for full-time work, not contract work...
That's all I'm really saying. I agree with you, though, that the to-do thing is a good idea. I just think there might be some middle ground, like if your task is "Build a feature to send verification codes through Twilio", then instead of using your codebase, I do it on my own in my own way. Then you can use my code as a model for your own. You don't have to research the whole problem -- just port my code into your codebase. And I don't have to fiddle with your codebase until you hire me.
Something like that. (Just thinking out loud here.)