There's a bit of misunderstanding here. You didn't buy digital content on Funimation. You purchased the physical copies (DVD/BluRay) and also got access to it digitally on your account, sort of like a bonus. I do understand the frustration since Funimation said you'll have access to it forever online. I don't know what to say if people bought it solely for the digital convenience. But you still have access to the physical media.
Taking back a sold good (access to a digital library) after sale is nothing but theft. Imagine the bag boy at your supermarket would take an apple out of your purchase and eat it.
Voicing "I do understand the frustration" is not the answer to stealing.
It was still part of the purchase. It was often part of the advertised product. You purchased digital content from Funimation, and Crunchyroll is revoking access to that purchase.