> plus it can all be deleted at any time if its on their platforms
No service like that will ever be big (ie mass consumer), if it involves installing and operating the infrastructure yourself. There are no exceptions, there never will be.
There's a reason automatic / SaaS blogs smashed the self hosting market. Handling all of that yourself is wildly obnoxious, if not entirely impossible, for an average person. Wordpress.com is far larger than self hosted Wordpress at this point. Movable Type died for this fundamental reason (they failed at the transition to being a SaaS, and died in the self-managed fire). Then you have Tumblr, et al.
There's a reason nearly all content publishing occurs on centralized systems. And a reason why basically all efforts to decentralize that have failed.
There's a reason decentralized social (eg that might compete with Twitter, Facebook, Pinterest, Reddit) has never taken off and will never take off.
99% of all potential users do not want to operate their own setup and they never will. Decentralize-everything is the ultimate fantasy (you'll see it in nearly every thread about social media on HN going back to the beginning). It's a near universal failure, because it's echo chamber thinking that ignores what 99% of end users actually care about. It's typically an engineer confusing what they want or care about versus what the larger market cares about.
My suggestion: do not, under any circumstances, go down the decentralized content publishing path. It's the path of failure and tears, without exception.