The whitepaper is very good and informative. The linkedIn profiles of the team members are missing and the website also contains less info.
We only don't know how they send you the tokens because you don't have to insert your ETH address anywhere. Probably you get further instructions via sms or on their Telegram channel. We keep you updated if we know more and if you do so please contact us :)
The airdrop is hosted on the official domain sopay.org and should be legit.