Scammy companies can twist or outright ignore a contract should they wish to; they have more money than you, and can drag out a court case until you go broke and give up. It's all very well to focus on the specifics of the contract, but if the other party is unethical, and better resourced than you, they're not going to honour it. They'll do whatever they want.
Plus, you don't want your name affiliated with shady companies. People will assume that you're a) a sucker, or b) also shady. Both of those assumptions are bad. (Not saying you're either of those things, but people are quick to judge.)
To answer your question on contract specifics, the one big thing I'd suggest looking out for is ensuring that they do not take any stake in your IP. Not a single percent. If they go under, any stake they have can prevent you from signing exclusivity rights to another company, or even continuing to create or publish your work at all. And release clauses can be where sneaky legalese sometimes snakes its way in, making it easy for the company to claim "no, actually, we do still own a stake in your IP, so you can't do anything without our consent."