Looks too risky for forum users. twn.io is largely non-functional, with mostly-broken links & no terms of service or anything, but it seems that it will ask for deposits. PM me with a lot more info if you want to advertise in the future.
We'd like to buy 2 spots.
1. To advertise referral program, where users can earn up to 20% bonus paid in crypto https://account.alt.estate/referral
2. To invite users to test prototype.
No ICOs. The alt.estate one seems mainly focused on getting people to invest, even if you frame it in other terms.
No idea what you're going to advertise; rejected.
Auction ended, final result:
Slots BTC/Slot Person
1 0.14 KryptoKash
1 0.12 walleting.services
1 0.12 TD Games
4 0.10 ChipMixer
2 0.10 bookiepro