There are semi-legitimate cases where this is warranted. For instance when looking at a Notion database, standard Ctrl-F is almost useless, and document search needs to go through the notion API to return results, sometimes even related to the entries that are displayed on screen.
I say "semi-legitimate" because I actually wish they'd map to a different shortcut, but can see the case for user wanted the remapping.
This of course stems from earlier decisions to have that document handling style in the first place. IMHO it becomes a complex debate when on line between an online application and a webpage.