Losing bitcoin could've happened with every user atleast once. Most of the time this happens through scammers. When we're new to the market we easily fall to the scammers as we don't know much about the market as well as the risks. In this way I've lost bitcoin on untrusted trading platform as well as on using a wallet that scammed the funds and ran away.
This comes back to myself it seems when it comes to scammers because if we are careful then things like this will not happen, I have been in crypto for several years, especially in bitcoin but until now I have never felt that way because I have always taken good care of myself regardless of seed or my portfolio stuff. I don't want something like this to happen so I'm more careful with it, while maybe some of us have still lost because of this, then chances are you still haven't done your best in guarding your wallet.