C.Not cool: I mainly use Firefox, but keep Vivaldi around for sites that only work with Blink/Chrome-based browsers.
I hadn't opened Vivaldi in a while, and it had updated since the last time. I have my start page set to blank/empty - and when I opened it there were two big sponsored speed-dial entries shown.
I have always had all sponsored/suggested/etc features turned off.
Bad #Vivaldi.