This. They even use CEX.io's own logo and graphics. Complete scam.

As for the betting site, it is also a clone of other scam sites. See here for details: https://scamscavenger.tech/projectinfo?project=lucktocoin.com. A quick web search will also reveal that the entirety of their FAQs, Terms, and Provably Fair sections are plagiarized from various other sites.

Avoid them both. If you have signed up for either of them with the same password you use anywhere else, then you need to change it immediately.