Nope. Of course, not. Any centralized exchange can end up like FTX. That's a given. But it's not because they offer cheap fees, even free withdrawal fees. Offering cheap or free withdrawal fee isn't at all an indication that it is poorly run like SBF did with FTX. Such offering is purely to attract users and to compete against other exchanges. But, again, any exchange can fuck up anytime!
Well, I don't think these kinds of offers are necessarily red flags. They're not suggestive of how the platform is being ran. I guess the best way is to suspect all centralized exchanges.
Whatever the founder is doing backstage could be beyond our reach. Cheap or free fees can't give us any idea. FTX users probably didn't know that SBF was buying expensive yacht and sprawling mansions and squandered money on gambling before the exchange collapsed. QuadrigaCX users probably didn't know that Cotten was travelling lavishly around the world, lost millions in trades, and bought luxurious vehicles before the exchange went bankrupt. So, I don't know if we can research these facts.