If they have a good reason they believe they can succeed, that's information they should bring up when trying to advertise the job role. I'm not entirely sure what kind of information could possibly make, "We have no experience at all making webcomics, but we're making three at once with such a bloated, excessively large team that means we'd need the artist to do months of work for free and then they'll only make pay enough to make the job worth taking if our comics pull in several hundred to a few thousand dollars a month." sound like it's a worthwhile investment.
The only reasons I'd even consider this project would be:
- They have an investor who has pledged several thousand dollars to get the project started or publisher backing following a successful pitch (obviously they haven't because otherwise they could pay the artists).
- One of the writing or art team is extremely famous, like it's Neil Gaiman or somebody, so they're pretty much guaranteed attention, and even if the project failed or the artist got paid peanuts, the prestige of having that collab on your list of past work would look really good.
The poor grammar of the posts, and the fact that they're searching for artists on the Tapas forum with a very fuzzily defined plan would make me extremely surprised if either of these was the case, because this doesn't come across like a very professional or well-connected team. A reason like "it's a really good story idea" or "one of their artists can draw an okay looking front-view face in a neutral expression on a blank background" wouldn't convince me, because story ideas are easy, it's the execution that's hard, and years of teaching manga workshops has taught me that even a lot of random teenagers can learn to draw a good front-view face in a neutral expression with no background; it's not a good way to show somebody's going to have the range and consistency or visual storytelling ability to be a great comic artist.
If somebody wants to take a gamble on them, I won't (and can't) stop you. Who knows, sometimes like a lottery, these things can shake out. That said, based on what pretty much everyone with professional experience has said in this thread, I'd recommend any young artist to be wary of all the red flags everyone has pointed out and assume the odds of getting paid are low and go in with a mindset of building experience.