Has-text is case sensitive. Adding / before the keyword and /i after will set it to case insensitive.

Example:

lemmy.world##.d-sm-block.d-none > .row:has-text(/Blockchain/i)

You can also use | to add multiple keywords to the filter.

Example:

lemmy.world##.d-sm-block.d-none > .row:has-text(/Blockchain|ChatGPT/i)