When they listed MOON (around Feb 2020 I believe), 0.06 BTC was worth less than 600$ so pretty affordable and someone probably just paid this money to list MOON on Unnamed.
It was March 2021 (not February 2020) according the post below.
We are now on Unnamed.Exchange with 5 trading pairs. Withdrawals recently fixed.
MOON/BTCMOON/DOGEMOON/LTCMOON/ETHMOON/UTIPThanks to Bob and the U.E. team for getting us working on the Exchange!
Note: the Mooncoin project does not officially endorse any exchange. Use at your own risk.
Well the graphs on Unnamed exchange go as far as Feb 2020 that's why I assumed it was the time of listing