No subscription limit
Pro account gives full access to most calendars in all formats (ICS, JSON, CSV, TSV, XML, RSS) in all languages. Data can be used for commercial purposes excluding the following:
American football, Baseball, Basketball, Football, Formula 1, Ice-Hockey, National elections, Pokémon Go Events, Pregnancy, Rocket launches, Tennis, Tides, UV index, WRC, Weather
You may display the data any way you wish, but you may not resell the raw data.