Doing airdrop on telegram mostly will become a penny of worth's. My only success with airdrop is with Supra. I got $600 worth of token but it staked for 15months. Well free money..
That is not bad at all for a free airdrop. I don't really know good sources right now to find promising airdrops (sometimes this forum has good suggestions) but in the past there were a couple of nice airdrops that paid quite high (including uniswap and years ago bitcoin cash) and the requirements were quite easy (especially for bitcoin cash).