Because the tag is only supposed to be used to introduce yourself. He is abusing the tag so people will see his post more when searching for the introduceyoutself tag. It's what we call in Amazon Bad Hat Practices and people like that make it hard for companies like steemit to make a community everybody can enjoy. I am very new to Steemit and I apreciaate people looking out for people possibly spamming instead of helping build an amazing community.