You should have told this fact to Yahoo management before they invested in Alibaba or maybe to Naspers before they invested in Tencent.
Sounds like confirmation bias, also one of life's mysteries.
Citation definitely needed.
Most of my investments are in stocks and funds outside of where I live (Netherlands). Guess which parts of my portfolio aren't doing so well? The EU bonds.
"I would not buy what Tencent is buying."
Tencent own a lot of stock in (international) companies that are doing well too. For example, Riot Games, Epic Games and Snapchat.
Similar things can be said about Alibaba.
Tencent was a major investor in Magic Leap and the Saudi Sovereign Fund invested heavily in .coms in early 2000. It is definitely not a sell signal, but I would not buy what Tencent is buying.