It really don't affect the price cause it never have a recorded transactions appears in the blockchain. This simply means that huge investors/whales do some market manipulations by using this strategy and taking advantage over the small players.
It is not really good to us but we haven't such power to stop them cause they are the so-called big players in crypto and making prices to move.
That is a wrong thought process, OTC transaction means they are doing business without the help of exchanges and you really do not see those buy orders in any exchanges but it will appear in the blockchain, if not what is the point of these transactions, these OTC transaction does happen only for huge buy and sell orders, on the other hand whales manipulate by showing these transactions in exchanges which causes panic situation among other investors.