The Albert app doesn’t charge any fees (other than the Genius subscription, which is billed annually), so any money you see disappearing from your account isn’t being “taken.”
Instead, it’s likely being transferred to a savings account on your behalf. The Albert app automatically budgets how much you can afford to set aside for a rainy day, and it will transfer that amount (in increments of $5 to $100) to your savings account.
You can turn this feature off if you don’t want it (or switch to a single transfer amount on a set schedule), but it’s an effortless way for many people to start building a nest egg.