I'm less concerned with the reuse of their logos and more concerned with the fact that their logos are implemented in HTML/CSS rather than as images, which mean

I'm less concerned with the reuse of their logos and more concerned with the fact that their logos are implemented in HTML/CSS rather than as images, which means there will be subtle differences. Basically those aren't their logos. They're slightly inaccurate imitations. Most big brands will be upset if even a few pixels are off when their logo is displayed.