Is it Mixin Safe or Mxin
g Safe?

Thank you. It has been taken cared.
One thing I really don't like from start is that I have to use my phone number to use Mixin app

I will see if I can do something about it.
All 100 members will receive 0.003 BTC, or only selected few of them, since you say they will have a chance, sounds more like some lucky draw?
Assuming we will have 100+ members over 5+ pages of applications. Each of them who will be accepted for the review will receive 0.003 BTC each in their wallet with a deadline of around 7 days to complete their reviews :-D
I am planning to make it 25 reviews in each batch. There will be 4 batches of reviewers. Each batch will have 7 days time to submit their reviews.
I hope that the reviewers will have the opportunity to test the service without paying a subscription, because I see that the price of the service starts at $100 per year. But, I will wait to see the exact conditions of the campaign.
Maybe download the app and start checking their features to prepare yourself for the review you will plan.