@leocg well isn't that interesting!? on your suggestion, I checked a few sites;
bitchute.com - no previews
youtube.com - previews come in!
rumble.com - no previews
https://www.brighteon.com/ - previews come in!
I got this error on peertube.org'
Your connection is not private
Attackers might be trying to steal your information from joinpeertube.org (for example, passwords, messages, or credit cards).
NET::ERR_CERT_DATE_INVALID
Help me understand
joinpeertube.org normally uses encryption to protect your information. When Opera tried to connect to joinpeertube.org this time, the website sent back unusual and incorrect credentials. This may happen when an attacker is trying to pretend to be joinpeertube.org, or a Wi-Fi sign-in screen has interrupted the connection. Your information is still secure because Opera stopped the connection before any data was exchanged.
You cannot visit joinpeertube.org right now because the website uses HSTS. Network errors and attacks are usually temporary, so this page will probably work later.
https://www.ted.com/ = no previews
so I guess its hit and miss