Mainly everything that centralized exchanges like Binance do is to make money. The fact that they advertise shitcoins as "cheaper options to withdraw bitcoin" is because they want to advertise their own shitcoin called BNB. In fact there are a lot of things they encourage people to do using BNB which is the only reason this shitcoin has been pumped. Who makes the most profit when it pumps? Obviously Binance since they create it out of thin air and sell it to newbies.
People who invest in or use BNB or other altcoins can not say they do it because of Binance or any exchange. They are responsible for their reasons of investment or choosing a coin for their transaction.
After Binance, many exchanges create their own tokens and own chains. They follow Binance by shilling their own token and chain and provide promotion with good bonus for users who use their tokens for trading fee or withdrawal. People decide to use or not. If they decide to use exchange token and chain, they should not say it's because of exchange promotion even they don't like those tokens or chains. If they want to take bonus, they will have to take risk.
Altcoin chains are less secured than Bitcoin network.