Opera silently puts advertising in SpeedDial

On Android, I got a "starter set" in Speed Dial, including: Play Now Free VPN Amazon CNN

then later, they snuck in: Nordstrom Walmart Booking.com

I think they've done it in Presto too, when updating to a new version.

No! They didn't. I've been using Opera for more than 15 years. I would notive immediately.

I definitely got bookmarks at the very least. Not sure about speed dial, that may have been only on fresh installs or on chromium. It's been quite a while since Presto last updated. :)

Firefox has sponsored tiles too. It's easy to turn it off though.