tied up (nonsexual) is an incredibly misused tag with nearly constant mistagging.
緊縛, its othername, links to a Pixiv tag which is largely bondage even when filtering for non r-18 works. Looking at pixiv tags for certain mistagged work with Pixiv sources revealed a decently high amount of 緊縛, so I suspect careless othername use is at fault for some meaningful percentage (while I didn't find it in the sample of appropriately tagged images I checked)
While it might be strictly correct to have it as an othername, it seems that its presence is probably a net negative for proper tagging.
Please discuss if you have more input or are opposed to this.