Shadow of War gold currency without microtransactions

You can get gold by finishing in game quests, for example as quoted in this link:

Fortunately, for those that want to get a chance at better loot chests, but don't want to break the bank, you can earn small amounts of Gold by completing challenges. The challenges change each day, and vary quite a bit in objective, but are never too difficult to complete. Today, one of my challenges was to recruit two Orc Captains in Minas Morgul for 50 Gold.

When the game gets a full release, there will also be community challenges that reward Gold. However, as of right now I don't have the information on what those will entail.

(emph mine). This means you get 50 gold for completing this quest without paying any real currency.