Our initial thoughts, rug-pulls are mostly done at Pancakeswap. We found there were many in Uniswap as well, so beware!
It is not uncommon we see in BNB pairs like this one, the developers basically waited to accumulate over 50 BNB, then here goes the big red candle.

And the below is at Uniswap DeFi11️ $0.00000000784 — Pair Explorer — DEXTools.
The Developer adds some ETH to the liquidity pool, before removing completely.