This will depend on how we see the new exchange. Sometimes, they offer very interesting and also promising rewards, very low transaction fees, or event various events or programs. And sometimes, many people are trapped to be interested in this kind of promotions.
Well, it depends on each individual.
New exchanges attract me if they have bonus without any requirements to make deposits or volume of trading to claim bonuses. Some exchanges give you free money for registration and they give you more if you make deposit, trade.
Beware of risks for deposit first if they require huge amount. There might be different tier of deposit to claim bonus and please don't fall into top tier, with big required deposit. If I join such bonus, I choose small one, just for fun and I don't stay on new exchanges for long. I will join them back if later they prove that they are legit exchanges.
If we already have our own favorite exchange, we do not have to try to use the new exchange before we know if that exchange is real and good for trade because we must avoid the scam exchange, as @OP says. If the new coin or new token is listed on the new exchange, we may need to wait for a while and see how it progresses. If the progress is good, maybe you can try to trade for a small amount to see if that exchange is fitted for you. Otherwise, you need to stay away from using that exchanges.
That is it. Sometimes, for shit coins or tokens, you have to make deposit to a strange exchange, to cash out. Mostly, they are not scam at beginning so when you cash out, withdraw your fund immediatly. Don't stay and trade on new exchange, if they are keen on listing newborn coins or tokens.
Even though not all of them are scam though, imagining wayback on how Binance and other famous exchange atm did start where it did really came from scratch.
I know. Legit exchange will do start with big and old altcoins. They will expand to new coins/ tokens later together with promotions. If one new exchange tend to focus only on new coins / tokens, it is not a good signal. They might scam you.