I think they are just looking for any feedback that will help with improvements to the next version of the app so making a deposit would probably help them with that but if you’ve already got advice then throw it their way (what you like and what you don't like). It’s a giveaway, not a test-bounty program but there’s a fairly high chance of winning. They recently shared it on their Telegram.
At the moment the app is just a decentralized exchange that facilitates crypto-fiat gateway between BTC, ETH, PLU and EUR. I don't think it can handle any other currencies just yet. They say they are adding the payment functionality next month so you can pay with the above cryptos at 40million stores worldwide which is pretty cool. When you want to pay it is converted into spendable fiat before going to the merchant.
Let me know if you've got some other questions?
Indeed, i can't make a deposit for two main reasons:
1- Deposits are limited to bank transfers which is not possible from my actual country of residence.
2- I don't think anybody would make a deposit for test when he should be paid for that.
I don't know what is the reason of publishing a review in telegram (why not here or in any public channel) but i continue asking about the giveaway how it will be credited to winners?