i have a wordpress site running on http://localhost:80 which I wanted to expose to the internet. Tried it using cloudflared and the website is accesible but there is styling associated. I use a wordpress theme which works fine on the local netwrok but looks abominable over the internet.
Ideally you configure your server properly, though in a Tunnel context (and only in a Tunnel context - and only in a localhost context), that is not immediately insecure per se.