Even now anytime you access Reddit mobile website and see an NSFW post, it would prompt you to install the app without an option to cancel. Literally the only way to continue without switching to the app was by using old.reddit.com
I've been finding websites more frequently overrule when I select "show desktop site" in a browser these days. I'm guessing that they just have one version of the website and it reorganises based on the devices aspect ratio.