Is it advisable to use multiple roboadvisors?

If you're using multiple roboasvisors for diversification, might be cheaper to buy a few index funds yourself to save on the fees

I know people who do.. rather than keep in one basket.

No, too confusing if too many

Pros - some risk management (different platforms, in case one collapses), but check whether the underlying investments are the same

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Cons - troublesome, difficult to track, hard to get a sense of your consolidated portfolio, can result in more fees.