Celsius Network announced early Monday morning that all user account "withdrawals, Swap, and transfers" will be paused until further notice.The development is invoking painful memories from the Terra/Luna collapse that is still fresh from just a month ago.The integrity of DeFi is brought into question once again, compounding pains for crypto investors, including those in the largest and relatively safest cryptocurrency Bitcoin.Bitcoin has slipped below $23,000 for the first time since 2020, invoking fears of a long, crypto winter ahead.