According to BitMEX Research data, Bitcoin ETFs saw a total of $888 million of outflows last week. Although the rate of outflows slowed down over the course of the trading week.
The selloff appears to be driven in part by bankrupt lender Genesis offloading it's GBTC shares. GBTC outflows amounted to about $2 billion, while the other nine funds brought in about $1.1 billion.
sources: Blockworks, BitMEX Research