Which makes it easier to keep up the momentum

source

Copper acetate crystals are also really cool! source

How is this an ad? They are informing you that you can get more out of your subscription. Would it be better that they’re didn’t inform you about this and hid it away in some obscure menu somewhere?

There are lots of reasons to not like Google/YouTube, but I can’t see how this is one of them.

Edit: There is also a clearly visible dismiss button.