Micro.blog is adding ActivityPub federation support and cross-posting to Mastodon https://www.manton.org/2018/11/07/microblog-mastodon.html
Micro.blog + Mastodon

For some time, we have been considering how we could open up compatibility between Micro.blog and Mastodon. Any feature that could be disruptive needs to be approached carefully. In this post I want to talk about how Micro.blog supports Mastodon, why I think itโ€™s useful, and anticipate some questions that weโ€™ll get about this feature. Weโ€™re launching 2 major features today: Micro.blog can now cross-post to a Mastodon user account, in the same way we cross-post to Twitter, Facebook, Medium, and LinkedIn.

@Gargron

...and, of course, this microblog post is an example as it's now straddling two entries.

#2 - Blogging to my own blog is a possibility but hey, that's a lot of work. YAML front matter, subject, words, publish ๐Ÿ™‚

@andyc @Gargron I am of two minds with micro.blog. On the one hand I dislike the idea of closed source solutions federating with the network while on the other hand anything that makes it easier to blog and express ones ideas can only ever be a good thing.
@carbontwelve @Gargron Ah yes. I didn't realise it was closed source. While $5/month is nothing, I envisaged self-hosting this software in case micro.blog dies. Been bitten too many times by that.
@andyc @Gargron Putting mine and others verbal dislike of its proprietary nature aside. It's still an exciting product, it provides a purpose to people for whom self-hosting isn't an option.

It could be argued that anything that increases the visible footprint of the federated community is a good thing and open source alternatives will begin sprouting if there is a need.