When pasting content copied from other websites, we escape what-can-be markdown formatting. For example if a paste contains:

[abc] some words

We want to escape those square brackets otherwise we’d introduce unintended markdown formatting.

I did add a clause though, we escape markdown formatting only if the copied content comes from a rich editor like Apple Notes or a website.

Anyway, you can skip escaping by holding shift while pasting. I should probably invert these conditions because mobile doesn’t have a shift key