We heard that crypto is often used for terrorist funding, but according to IOCTA in 2018, such an assumption is wrong.
Today, the popularity of Bitcoin is getting better, but the relationship with terrorist funding, they prefer the classic method of transferring through banks.
so, terrorist groups that use bitcoin are only low level transactions.
Bitcoin being used in illegal activities is not something new. Some of the people in the dark web use bitcoin as a payment instead of fiat money since it is harder to track bitcoin transactions. I wouldn't be surprised if Bitcoin is used in terrorist funding. Making the money untraceable.