I think the base game is quite cheap and there are a handfull of dlcs that are really meaningful, which you still don't need. Also the base game has gotten updates for at least 5 years now so i think it's fair. And it works good on Linux.
Edit: It's from 2016, so no wonder there a lot's of dlcs. The base game has gotten overhauls in the meantime.
I think the base game is quite cheap and there are a handfull of dlcs that are really meaningful, which you still don't need. Also the base game has gotten updates for at least 5 years now so i think it's fair. And it works good on Linux.
Edit: It's from 2016, so no wonder there a lot's of dlcs. The base game has gotten overhauls in the meantime.