I think you do not know exactly the meaning of these words.
ICO - initial coin offering - dev offers investors some coins for money to fund the development. - And that is what you meant I guess and it is ok.

But if you do an airdrop or bounty for something then you are the one who pays coins to the community and not community to you.

So if you want the community coin you should be prepared to do some airdrop and be ready for bounties to make your community bigger and happier