Bandwidth varies, both in width (speed) as well as depth ("caps" or limits per time period), so these should be considered. However weather data sent to 3rd party services is typically low use.
I feed my own hosted site, CWOP, WeatherUnderground, WeatherBug, AWEKAS, WeatherCloud, MetOffice/WOW, Weather For You/PWS Weather, & Twitter.
I used to feed Wetter-Board but they made changes and I never re-created my feed. WindFinder never responded to my application.
There had been questions about AnythingWeather and OpenWeatherMap (IE: how they use the data provided) in the past so I never joined those.