FWIW I have a free app installed called iVerify that mostly just reminds me when a new iOS is released but recently I noticed they added a "Strip metadata from

FWIW I have a free app installed called iVerify that mostly just reminds me when a new iOS is released but recently I noticed they added a "Strip metadata from photo" feature to the sharing tray, so you can pipe a photo through it and then copy to another app.