There is a set of cryptocurrencies that can be supported by multiple networks. When expanded to multiple networks, cryptocurrencies can get a larger transaction capacity along with reduction of fees spent for managing the funds. So, it is done to enhance scalability. What is more, having multiple networks available cryptocurrencies become more popular and accessible leading to a better adoption.
This is essential to mind the network before initiating the transfer. Otherwise, having chosen an incorrect network of the destination wallet, the funds may be lost never to be recovered. That is why, double-checking the network is of utter importance. That is much easier to be distinguished - having the knowledge that the different networks designate different wallet addresses for the same currencies such as USDT etc.