Is it taboo to give serial RMB?

Yes, some people still like it. The only source of a lot of money is the bank. Now is the high-tech era, and the circulation of funds is very convenient. There is no need to withdraw a lot of cash in daily life. Even if a huge amount of cash needs to be withdrawn under special circumstances, the bank will ask about the purpose and make a very detailed record of the cashier and flow direction of the money. Therefore, the huge amount of serial cash is locked when it leaves the bank.