And of course, what the block explorer
then allows me to see, is who actually has dumped the coins they earned through bounties

how can you know that from the block explorer? You can see transactions sent from there, but if someone send to an exchange for example, how can you know if they didnt sell any or even sell a few but then rebuy even more coins later? Or how can you know if the address that is send is really from the exchange, since the exchange generate one address for each person?
Explorer shows a series of receipts into one address, then a single, bulk, transfer out of that address. Too much of a coincidence. Anyway, it doesn't matter. I'm just interested in the psychology at work here.
Yes, but i wonder in a broader sense, not necessairly in this specific case. I mean, for like what bitcoin or some altcoins advocate is anonymity. One can send a coin to a specific address, but when it goes to an exchange, for example, it wouldn´t be easy to keep track of what exactly happends inside of their enviroment since buy or sell orders can come from several different people. I will use myself as an example, i have sold some coins, but then i rebuy even more coins at a lower price, so how can you keep track of how many i buy or sell inside of the exchange without being the owner of the exchange? I mean this more as a curiosity, from the anonymity philosophy associated with the altcoins and the exchanges.