Someone must take the other side of every sale, and a large position can only be sold into demand that exists at the time. When insiders hold tokens at a near-zero cost basis and a marketing push brings a wave of new buyers, that wave is the exit.
The structural signal is supply meeting attention. A token-unlock cliff, a listing, or a promotional campaign that coincides with an unusual burst of coverage is the pattern worth recognising. It is not always deliberate, and the effect on your fill is the same either way.
The defensive question is simply who is selling to you and why, and whether the depth is there when you want out. market-depth-crypto and the price-impact of your own exit size answer that better than any narrative.
Related: token-unlock, soft-rug, pump-group, price-impact