@Bennett Yang Welcome to the Atlassian Community.
Trello Gold is explained here: https://help.trello.com/article/817-trello-gold-user-guide
I do not believe it is going away but I will escalate this issue to Atlassian to confirm.
No sign of gold going away as of today. I can understand the confusion around this as going to the gold URL takes you to a pricing page with no mention. This is due to gold being an add-on for individual Trello account and not a bulk pricing tier. More explained from the referenced document above:
Trello Gold is an add-on pack for individual Trello accounts that adds a handful of features. You can see when your account will renew, update your credit card info, see billing history, and so on in the “Billing” section of your user profile at https://trello.com/my/billing. If you signed up via credits, you can check when your credits expire and you can enter a credit card and sign up for a subscription. You can cancel Trello Gold via a link at the bottom of the billing page.
I hope this helps clarify how gold works and why it's not displayed on the pricing page.
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