Phun.io is an online crash casino using Bitcoin SV. 😃 I hadn't earlier even heard of that term, but googling gives an explanation (and this is from another similar online gambling site's [bustabit.com] description):

"[...] an online multiplayer bitcoin gambling game consisting of an increasing curve that can crash anytime."

The Phun.io domain name, source code, user database, etc. has been on sale on Bitcoin Forum since 13 June 2020:

https://bitcointalk.org/index.php?topic=5255252

Phun.io is offered for 1.6 BTC. The site has existed about two years and it has about 9600 users. An important detail from the seller:

"Buyer will need to fix the current depositor to work with Bitcoin SV (BSV) as it is not compatible with the recent Bitcoin SV upgrade. We have been manually processing deposits lately. Automatic withdrawals has been working as normal. Everything else is 100% working."