Obviously, development (if that is even applicable to these trash coins) of 'celebrity' coins or just coins they endorse, are mostly pump and dump schemes. If they really cared about crypto, they would allocate money to the development of already existing (honest) projects instead of allowing themselves to be used as billboard in return for gross sums of money.
Andreas Antonopolous two days ago tweeted that he is being offered up to $250,000 by ICO's for his endorsement, which he declined, but many other influential social media characters will accept. This is the sad thing about a bull run, because these scammers can now afford to pay these sums of money again. If there will be an altcoin boom, $250,000 offers will become $1 million offers. Who is strong enough to resist these offers?