Speedbumps are a recommended action. There is no regulatory requirement, but they are advised as a best practice because you want your customer/user to know that management of the site they're going to is different. Privacy policies, cookie policies and the use of data may change. Risk mitigation is what it is about.
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AndyZ CRCM
My opinions are not necessarily my employers.
R+R-R=R+R
Rules and Regs minus Relationships equals Resentment and Rebellion. John Maxwell