Hey Freee,
That’s super cool of you to offer a giveaway, and thanks for being such a generous person!
I agree with some of the other posts. My first thought also was that people may have developed some level of skepticism — even call it “healthy skepticism” about giveaways, both those offered in the game and in real life, too! (Did I tell you about that poor person, a member of the royalty of XXX country, who offered me £45,000,000 if I would help them get the estate of their assassinated relative settled?)
I am in the game every night, and I see quite a few offers. Sometimes it’s clearly a joke and sometimes it’s really not too clear if something is legitimate or not. Also, I have a few agendas, so as Djinn said, whether I get diverted to participate is pretty subjective. Although I have to say that 90G would be pretty darn likely to catch my eye. 
I hope you’ll continue to do fun things like this, and I do mean fun for us players and fun for you, too!