Havn't found a way to delete yet. But can turn em off in alert preferences. Your the only one who can see them.
Will keep looking but am on the master forum and longtime programmers are being asked the same question. Also, knowing your concerns about privacy, You can set all preferences in "my Account"
Click on the 4 ball thing below the search icon. That opens a "quick navigation" page to your account. Has every option possible.
Gonna see if I can get a screen shot on my phone and will edit this post. One sec