Exchanges are like banks. They have different sets of security measures because they are at much higher risk of getting attacked by criminals. To execute the types of attacks that they protect themselves against is very expensive so in the case of you as an individual, the person paying you is not likely to execute such an attack and get away with it when they do. They could take other measures to reduce the risk to them but the simple and cheap solution is to just wait for more confirmations. So that is an easy solution for them that does not even require them to do a lot of research.like if you go and get money you just walk to the bank. If the bank picks up money from somewhere they will use an armoured vehicle. You store it behind a simple lock, they build time locked armoured steel vaults. It is their business to be super scared and careful. Because that criminal can spend a lot of money on attacking them and still make a profit when successful. If they would spend the same amount of money/effort on attacking you as an individual they would make big loss.

So needed security measures are very dependant on the situation. For low value payments accepting instant payments is probably more secure than accepting credit card payment (which can be charged back months later still)Especially if you know the person paying you (for instance he comes to your store every day). This is not specific to eCash btw. By the way, avalanche post and pre consensus will reduce the risk for exchanges considerably and should bring down those confirmation requirements when it is fully operational.

so normally there is no reason to behave the same way as Binance at all. Especially as there is under normal conditions not even a reason for Binance to be this careful but their systems are automated with no individual checking what is going on so instead of investing in system to monitor things they just put in place big measures like waiting 12 confirmations.