I was curious to know how many people bought the EA, I remembered that it had exceeded Larian's expectations.
Not that Reddit is a good source, but the numbers in the article mentioned there for Steam are close to or above one million. The number of people who buy into an EA might be indicative of broader reach when the game finally releases, or it might be most of the people who would buy are have, depending on if you think D&D and Baldur's Gate are niche properties or not.
SteamDB has some approximations, here is BG3 : Here are some other games for the record. DOS 2 : Pathfinder WotR : Solasta :
I do not believe one second DOS2 have become even near 10 million. Anyone can go and write review of games never played. https://videogamesstats.com/divinity-original-sin-2-facts/ Here it mentions DOS2 have reached 2 million sold and this was like after more then a year after DOS2 release.
It is true though that I am absolutely not PRO DOS2 and never have been fan of that game. Well and example me I could write review of DOS 2 on all those places and tell why I think it is bad game.