So many:

• Unsubscribe links that are magically broken.
• Newsletter popups when you’re trying to view content.
• Websites that are paywalled coming up in search engines.
• Broken shopping cart payment systems.
• The fact that it’s an assault on your senses to browse without an adblocker.
• “Sign in to view content” for articles, posts, etc.
• Banking sites that time out after a minute.
• likewise, shopping cart sessions that expire before you’re done shopping.
• AI generated articles that don’t even sound like they’re referring to the right topic.
• Recipe websites that have a 15 page story for each recipe without a way to skip to the actual recipe.
• “Endless scrolling” that prevents you from accessing links at the bottom of the page.
• Business websites that don’t list an address.
• “Password must be short enough to guess.”
• "How did we do? " emails.
• Automatic newsletter sign-up.
• Desktop websites that act as if you’re on a phone (i.e swipe through grocery filters instead of scrolling through them).
• Unreadable, archaic, and/or low-contrast fonts.
• “This content is not available in your country.”

I could list dozens more. 😮‍💨