Changed policy on the use of Blood
For decades the Governing Body Men said that God did not allow the use of many blood components. Many people have died just because of that policy.
Now you can have and give major blood fractions. Saving not only your life, but perhaps others too.

Watchtower said in 1989 “We do not donate blood, nor do we store for transfusion our blood that should be ‘poured out.’ That practice conflicts with God’s law.” -1989 Questions From Readers
Did God change his mind, or did the CULT leaders.
If the organization you belong to enforced this type of rule and then just changed its mind, it is likely you are being controlled by them. ITS a CULT. See The David and Goliath Story for more on CULTS.
For more proof of this change see. https://avoidjw.org/news/news-blood-doctrine-governing-body-update-deaths/ and this video on youtube https://www.youtube.com/watch?v=312yGixXGDQ&t