I do experience this as well, however, I don't see it as fear. Sometimes you have an idea and you start writing, then, as you write, you understand the topic better and it either feels rather obvious or doesn't feel like it brings a lot of value. So you stop. I wouldn't call that "fear", just a way of keeping the internet free of useless opinions (not that it's not already full of it, but doing my part!)
I felt this way too! Here's how I worked through it: 'keeping the internet free of useless opinions' is not a good thing. The internet isn't like a crowded room. When you're saying something, it's not like you're talking over someone else. There is actually room for everyone to say however much they want.
Also when you're spent a while learning something, things that seem obvious to you, won't seem obvious to others. It can be especially helpful for people who are at an earlier stage of their learning journey.
Just my 2¢!
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