go to gogole map API documentation to know the limit
There is limitation for the request map but also some service inside map API
like every service there are limit and strange ( happy sense ) there is an elevation service !!!
Best is to buy a VPN that let you change the ip to any country !!!! evey ISP should offer to have more subscribers but not a lot until now !!!!
@art i was thinking you know this limitation ....... as a developer ( i am myself a web dev ...not desktop)
I Read somewhere don't know when than some service base on google map go to osm to geocode ( don't know if it is about map or geocode ) but don't have documentation information and never search about free osm map geocoding service .
For voice to text the Voice API ( wonderfull , efficient ) also limit the number of character that can be translate at once . But can be use for domotic since command to trigger action are often less than 4 words !! ( microsoft translator on android is a tool to try ...)