Received free gift from Fizz, looks like security exploit - please confirm and warn user base

I received a text message from: 1 581 490 9362 indicating I received a $10 gift from Fizz.
The URL is flagged as a deceptive web site and likely contains security vulnerabilities.
Please confirm whether this is a Fizz site or not, and please warn user base if it's malicious.
How do they know which phone numbers are a Fizz customer?

Answers

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