Placeholder text for designs — 100% free, runs in your browser
Placeholder text lets you judge a layout without being distracted by the content. Designers use Latin precisely because it is unreadable — real text pulls attention to the words instead of the design.
Because it looks like text but cannot be read, so reviewers comment on the layout rather than the copy.
Never. It happens more often than you would think, and it looks unfinished to visitors and to search engines.