Since 2017, I have started to write with markdown.I tried a lot of software and chose Typora among the recommendations of many friends' articles.What you see is what you get. It's great.Most importantly, it was hosted on Github. At that time, I mistook it for open source software.Although open source does not mean free, open source at least means that you have the choice to establish your own portal.But in November 2021, Typora was