Maybe, but it’s always good to have several alternatives which can be used. The other difference is, Protected Text is is a good and valid option but only freeware proprietary, not OpenSource

Meh is an overstatement.

It’s a CSS compatibility problem. The site uses a linear gradient background (background-image: linear-gradient(to right, ...)) which is clipped to the text (background-clip: text) while the text is made transparent (color: transparent). Seems like your browser doesn’t support the text-clipping CSS property, so it ends up rendering the entire element as a box without visible text, filled with that linear-gradient.