I'm somewhat surprised. The National Weather Service in the US has a website: https://weather.gov. There is a radar map https://radar.weather.gov/ and forecasts https://digital.weather.gov.

They also publish the data for free, such as map layers/radar https://opengeo.ncep.noaa.gov/geoserver/www/index.html or the weather forecasts https://www.ncei.noaa.gov/products/weather-climate-models/na...

In the past The Weather Channel lobbied to get public access shut down but failed but most people selling weather data compete by building improved forecasts, local knowledge, etc on top of NWS data. It greatly lowers the barrier to entry for anyone wanting to get into the space.