John Jonas says sharing account passwords with your OFS worker is fine if you trust them, but keep a list of shared passwords so you can change them later. Having to revoke access means the relationship has broken down.
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You can give them the password if you trust them. And that this again, goes back to trust. Which, really, there's a lot of trust going on here, just like there is in any employment relationship. I recommend you keep a list of websites where you gave them the passwords. That way, if things aren't working out, you can go change the passwords to everything, and then you can let them go. And then they're already kicked out. Now it's kind of a crappy way to do things. If things get to that point where you feel like, oh, I need to go change all these passwords and then let this person go so they're not vindictive and coming back and ruining things, well, things probably went a long ways past where they should have gone.