They just announced inorder to receive their bonus drops during the livestreams and from their sponsorship announcements you need an account that has passed level 2 verification.
Since there are so many claiming it during these times they are gone within 3-5 minutes of them being given out.
This is a dissatisfactory step by the Stake team. Gradually they are making the KYC verification mandatory to be eligible for most of the bonuses and giveaways. They just made a bonus drop on their telegram channel with the level 2 verification requirement. The bonus drop had 2,000 claim limit, and it has been fully claimed by the users in less than 10 minutes.