Content creators on YouTube use this font heavily to create readable and highly engaging Tamil text overlays on video thumbnails.

Here's a proper write-up:

In legacy fonts like this, English keys are mapped to Tamil letters.

A small community of Tamil typographers is currently reverse-engineering MCL Valluvan to release a Unicode-compliant version called Valluvan U . This version would retain the original glyph shapes but map them correctly to the Unicode standard (U+0B80 to U+0BFF). Once released, this would allow the font to be used on websites and mobile apps legally and practically.

Official government or institutional documents that require a dignified look. Publishing: Magazine body text and newspaper editorials. Comparison with Other MCL Fonts