@Mossy I have tried Joplin a long time ago but didn't like it. Mainly because the lack of features and If I remember correctly it had a weird way to save things where as in obsidian I just make a folder and that's where my things go. I also like that the markdown files are dynamic so they change as soon as I type the next line. Once they add a pdf highlighting feature it will be perfect for me.
I was looking at the Joplin web clipper, but Obsidian came out with theirs just at the right time. I needed to save about 2000 twitter posts from my likes and it made it so much easier. I also played around with training AI on the data I saved (with chat-gpt in obsidian) It owrks decently.
As for privacy. You store your files on your computer and nowhere else. Not sure what you mean by encryption.