That was the collapse of ETH, because most of the airdrop and bounty programs were through the ERC-20 platform. Do you think the same thing happened?
The main reason for collapse not ERC 20 bounty or Airdrop .. That is not correct .
Eth price deteriorate because of total infinite supply 100 M ++ - someday eth developer must set a limit or we will see new decline down to 10 $ again .
ETH inflation is high today. It's about 17% per year (18M/100M) but at the end of 2020 inflation rate will be 15%.
According to my calculation, the annual ETH inflation rate will be 2% in the 2063 year (if conditions will not be changed due to some new consensus).