If you want to help but find configuration hard you can easily help by running a Snowflake proxy on your phone or in your browser.

I have configured my phone run a Snowflake proxy every time my phone is connected to WiFi and charging. It’s automated and does not require me to do anything. I have turned on notifications that tell me every time I’m helping someone connecting to Tor. It gives me a good feeling every time.

The sender is generating the link preview on Signal. Would this not eliminate the threat for the receiver? Not my field.