telegram has become a haven for scammers (i also get messages pointing to the hallowed arbitrum site that you mention) because of easy and simple access, almost every day i get messages from people who claim they are developers of a token project or a trading signal group, investment. i'm sure they make thousands of fake sites every day and there are 1 or 2 newbies that they manage to trap, for that you need full self-awareness when opening a message from someone we don't know.
Not only Telegram, scammers are using every means to reach crypto users. Currently, many fake websites are appearing on Twitter, which has created a dangerous situation for crypto users who use Twitter. Scammers think of their next scamming strategy every day and continue their activities to create phishing websites. Scammers spend money every time they create a new website because they get their desired victims. So now crypto users have to be more careful to avoid the traps of scammers.
Twitter users are among those who are very active, so several accounts were tagged by the fake arbitrum airdrop scammer
(thankfully, several fake arbitrum accounts have been banned), fortunately the big news media helped spread the word about this case and saved many people from this kind of scam.
[1]
https://www.numencyber.com/phishing-scam-alert-fake-arbitrum-account-on-twitter/[2]
https://www.nasdaq.com/articles/arbitrum-shows-just-how-messy-and-tricky-crypto-airdrops-can-be[3]
https://cointelegraph.com/news/beware-of-fake-arbitrum-airdrops-community-warns