The only decentralized blogging platform that I know is Hive Blog. Hive Blog is a part of Hive platform and rewards users for publishing articles and commenting on someone's articles. Hive Blog pays through Hive Token than can exchanged with fiat currencies.be I don't know how beneficial is Hive Blog because I have never used it. I would have surely joined Hive Blog if I was not blogging on my self-hosted site. Since I have my own site that receives traffic and generates revenue, I never considered joining Hibe Blog. One of the main issues with using platforms like this one is you need to be very active in publishing, commenting, upvoting, following writers, socializing in order to earn.
Most of the blogging platforms that I know are centralized platforms. I use wordpress, WordPress is an open source content management system, it is not blockchain based, and not a decentralized platform.
I just searched on google and found that there are already a lot of decentralized blogging platforms. The one that showed on the top was called Mirror (mirror.xyz). Since the domain uses xyz domain, I was quite skeptical but the website has been featured on trustworthy media. The second was called sigle.io. Another one is called Steemit, siasky.net, etc.