It's not merely snooping that is foiled by TLS encryption, it's tampering. Allegedly benign tampering has even occurred by ISPs who wish to inject ads into web

It's not merely snooping that is foiled by TLS encryption, it's tampering. Allegedly benign tampering has even occurred by ISPs who wish to inject ads into web pages. So the next time you're served an intact web page without malicious or extraneous content, you can thank TLS certificates such as those issued by Let's Encrypt for protecting that server's data from endpoint to endpoint.