What you guys think about bottom tab bar for mobile versions of websites?

I would like to hear what you think about bottom tab bar for mobile versions of websites. It is called bottom navigation bar too. Here an example: https://pitchfork.com/.

I am trying to use it to improve engagement of e-commerce websites in Brazil with this element but I need to reunite some good reasons to do that. I will post the links of my research later in this topic.

All the best!