Ciphertrace speculated the anonymous user made the transactions “to stay up to date with the Bitcoin network,” but it may have been hacked.
Source: https://cointelegraph.com/news/1b-of-bitcoin-from-silk-road-wallet-moves-for-first-time-since-2015
$1B of Bitcoin from Silk Road wallet moves for first time since 2015
November 4, 2020
CoinTelegraph