As someone who has worked on scraping sites that really didn't want to be scraped, there is all kinds of interference with dev tools in the wild. There are man

As someone who has worked on scraping sites that really didn't want to be scraped, there is all kinds of interference with dev tools in the wild. There are many ways to detect it's open (eg. https://github.com/sindresorhus/devtools-detect https://github.com/sindresorhus/devtools-detect) and it's also possible to mess with it without knowing it's open. A method that's wildly used is firing the debugger break command many times a second, along with other stuff that makes using the tools nearly impossible (slows the browser down to a halt)