Coinbase ‘Give Aways’

I have used coinbase since the beginning of my crypto journey. For all of the good and bad parts of the exchange, I’ve found it pretty user friendly. Every so often Coinbase holds give aways. You must opt in and purchasing/trading is not necessary if you go through some additional step. One thing that bothers me about these giveaways, is they never announce the winners, how many winner, which winner won how much…it makes me think the give aways aren’t real. How would we ever know if they are real? How would we know if they honor the ‘give away’?

TLDR: how to know if coinbase giveaways are real?