Depending on your active investment portfolio size, you are assigned to a loyalty category which gives you an additional interest bonus of +0.5%, 0.75%, or 1%, for all your future investments. Your return depends on which: Silver, Gold, or Platinum, the category you have.
Please note that your loyalty category gives your strategy/strategies a priority in the Auto Invest strategies queue. The Platinum category has the highest priority, Gold and Silver goes after.