To be honest, there never was any kind of radar, or if there was, time frame for profitability was low. Because most of the beneficial airdrops out there weren't anticipated and people didn't prepare for them for the sake of potential airdrop.
They just used the system because they liked it and because number of participants was lower, due lack of airdrop hunters and lack of bots, shares as well were valuable.
And while you can occasionally get a profitable airdrop, if you try to hunt for all of them, you'll be wasting all your money just for fees. So stick to the systems you want to support because you like them.
No, he didn't mean true radar but he only use the word as a kind of accessory.
If talking about some kind of a radar, there is still like that. What about the groups, this forum, and the social media?
Some airdrops are not free but it is fine as long as we got in a paying airdrop because we might still recover it and end up with some profits.
But, it is not only money is the one that we can spent here but also time.
We can potentially like an airdrop or a project but sometimes, we can't figure them out if we don't do a research. The advantage of joining on what truly interests us is that we can't feel that we wasted money or time if in case they didn't go well.