When I was reading this, it came from ethereum developer, they started defi project that led to the creation of many bitcoin pegged coins like WBTC and many others. I wonder why they are pessimistic about others but they are right to me, this is why pegged coins are risky than having the real coin.
https://old.reddit.com/r/ethereum/comments/rwojtk/ama_we_are_the_efs_research_team_pt_7_07_january/hrngyk8/There are many ways people are using altcoins but they think that they are having bitcoin, some are on the ethereum network, some are on binance chain, binance smart change, I might not mention some and some will still come up. These are risky, let people know that they are not using bitcoin, they are using pegged coins, they are pegged with bitcoin which makes them to think they are bitcoin, they are not bitcoin but altcoins.
Some people will be thinking of low fee, exchanges like binance also make this confusing and include all pegged coin chain along with bitcoin for withdrawal. If you want to use the bitcoin which is not the altcoins ones, know that bitcoin address only start from 1, 3 and bc1. Other addresses are not bitcoin address, they are pegged coin address which are altcoins.