What are the pros/cons of spreading investments across ALL/MOST robo advisors?

Doesn't make sense to me, each robo itself already very diversified with multiple etf. An etf itself is already diverisifed, a robo have many etf so it's even more diversified, if you use many robos is super duper diversiifed. Don't over do it, focus on one and let it compound better

To my knowledge, robo adviser portfolio usually offers a certain level of diversifying already. If you spread investment across more robo advisers, your investment amount per robo adviser will be generally lower. They usually charge higher percent of management fee for lower funding. This is one of your cons which you will incur.

Secondly, some of the roboadviser invested in similar etfs or stocks. So this overlapping doesnt really benefit much.

This is just my personnal view.