why the founders are sending steems to exchanges.
Because if you go back to the original thread it was stated that at least 20% of the coin supply (25% of the 80% that was 'ninja mined' the developers) was to be steadily sold on exchanges to fund development. For better or worse they are doing exactly what they said they would do.
I personally see absolute noting wrong with this. I'm even fine if most of the 20% goes toward lining their pockets rather than true development costs. If someone comes up with a good idea and implements it well, they should be rewarded handsomely for it. I guess some people in the cryptocurrency world just believe all developers should behave like Satoshi, who didn't move the vast majority of the coins he mined in the beginning.