I find there are still many bloggers doing this 'big mistake' (including those who commented on PortalUang). They consider that commenting is merely a matter of link building for the sake of SEO benefits
https://steemit.com/esteemapp/@aminaton/aircraft-made-of-cardboard-or-non-terpakek-material-this-way-of-thinking-matured-4e9b399fd5d8a