It kinda was, but they did this same rugpull and closed their free api way back before covid. They do still claim: "250,000+ Weather Stations Weather Undergr

It kinda was, but they did this same rugpull and closed their free api way back before covid. They do still claim: "250,000+ Weather Stations Weather Underground is a global community of people connecting data from environmental sensors like weather stations and air quality monitors " I think it's a bit like FlightRadar24 - if you feed them your weather station (or ADBS receiver) data you get some level of free access but with non commercial use restrictions.