Reputable content creators or the developers themselves sometimes host giveaways. However, be wary of random users DMing you saying you won a giveaway you never entered.
There is as a legitimate "Gamesense invite generator" . Gamesense (often referred to as "Skeet" or gamesense.pub) is an extremely private, invite-only community for gaming software. Any website or tool claiming to generate these codes for free is a scam . Why Generators are Scams gamesense invite generator free
The most "useful" story regarding a Gamesense (Skeet.cc) invite generator is a cautionary one: they do not exist gamesense invite generator free