Posts are removed in a few cases. Firsty, posts can be downvoted by the community. It is mostly 5 to 10 downvotes which make a post to be removed.
Some posts get blocked after they are flagged as inappropriate and moderated by our moderators. This is how our user moderation system works: https://jodel.zendesk.com/hc/en-us/articles/208767365
We also have a number of algorithms and dedicated team of admins who can remove your post, in case it is against our Community Guidelines
Also, if your profile gets banned all your posts will be not visible for other users until you get unbanned.
To avoid this, make sure to go through our Community Guidelines and keep that Jodel spirit burning! :)