Of course its their stake and they can do anything they wish. Needless to give any info nor explanation as none of us does with their stake.
But a”possible” sell off of such big amounts would most likely crash the price. Maybe at a level which will take double the years we expected...to climb and be stable at certain levels.
Ps. If almost 2.5 mil SP every week is dumped...that means for the next three months price will keep declining...so maybe tether or any stable coin sounds as a good idea(?) to possibly double your stake. For the long run users - believers
Potentially it would but then, I don't think that they will do that anyway. However, it is part of the game to see if one can sell higher and catch a low. eventually people will miss their buy ins though.