Mangadex doesn't protect uploaders against any legal action that may arise anymore small or big.
It's a hobby so I won't risk having legal action taken. I would rather continuing to translate without worry.
Do you understand the situation now?
I mean, I'm pretty sure Comick doesn't either. MangaDex is just more transparent about it.
That said, in the first place, legal action has usually been taken against the site hosting the scans, as opposed to the people actually doing the translations.
Hell, you're probably
less vulnerable on MangaDex, since MD actually responds to (valid) take-down requests. Other sites are a lot less cooperative with publishers, so if a publisher really wants something gone from there they'd have to go after the uploader.