One of the types of content that is not recommended by the social network are the giveaways. This decision was based on the desire of users of the platform, according a survey. And, needless to say, that was the item on the list that caught my attention the most.
I've done giveaways on my profile myself. Some I did in 2019 were in partnership with UK and USA brands and to be honest I didn't see a really significant result, despite very positive results in previous years, 2017 and 2018.
And I believe that Instagram is advising not to do giveaways precisely to prevent users from being harmed by scammers. There's a lot on instagram nowadays. Today, the platform has more than 1 billion accounts. However, it is not possible to know for sure the number of active users.