when it comes to interchain bridge the hacker don't really erase their trace by simply bridging though, the bridge can easily disclose where the money going on the other side of the blockchain since they also retain their own ledger for this and in the recent bybit hacking, most of bridges has been cooperating so far. meanwhile mixers are privacy tools and well, not easily disclosing where the money went.
It's difficult to obscure the trail of money using different bridges, as it can still be tracked. That's why those who don't want to leave a trace prefer mixers as their first choice. The bad reputation of mixers shouldn't be surprising. The majority of people who use them are involved in illegal activities and governments naturally want to take measures against this. Mixer usage due to privacy concerns is likely much lower, I don't think this will change in the future either. At the very least, the bad situation created by mixers no longer affects Bitcoin. Because by now, everyone has realized how transparent Bitcoin blockchain actually is.