There are constant of 51 840 IDENA coins being distributed daily. Current circulating supply is equal to 44 934 700 what gives us 52k x 365 / 45M = 42% inflation annually ... pretty much but let's take a look at that after 10 years.
circulation supply 234 150 700 and still the same 52k coins daily what gives us 8% inflation. It's still not what average crypto enthusiast is looking for BUT ...
1-" Miners get 10% of transaction fees, 90% of the fees are burnt. "
2- ~5-20% of minted coins are being burned due to mining penalty, stake loss due to 2 wrong validations in a row
3- even more coin will be burned due to penalties (f.e shitty flips) and due to IDENA showing its real world value:
"100% of ad payments will be burnt"
So IDENA supply is not limited but if project will succeed I believe that it will reach max supply one day and due to amount of coins being burned the total supply will start to decrease.