There’s something very funky about that spam… I have never seen a Playtech casino run a 1 hour free promotion, plus that other link “arengor.com/micro/1” looks suspiciously like a link to a Microgaming casino.
… ok, it’s definitely a spammy affiliate. That arengor link goes to vegasinternationalcasino.com and if you click on anything it will try to download Ruby Fortune.