Después de crear una campaña de Sponsored Brands con un presupuesto de por vida, puedes aumentar el presupuesto, pero no puedes disminuirlo.

This statement is true. When managing Sponsored Brands campaigns with a lifetime budget, Amazon Ads allows you to increase the budget if you find your campaign is performing well and you want to allocate more funds. However, once a lifetime budget is set and potentially increased, you cannot decrease it. This policy helps maintain the integrity of campaign planning and prevents frequent, drastic budget reductions that could impact ad delivery and performance consistency. If you need to reduce spending, you would typically pause the current campaign and launch a new one with a lower lifetime budget, or adjust other campaign parameters like bids.