You mean this deleted post:
On this thread: Investing 1$ every day in bitcoin over the last five years

Someone probably reported it for either being off-topic, or low content value. It is not uncommon for getting a post or two deleted per week. There are multiple reasons, but the two I provided are the main ones. Of course many alike may go undeleted if they are not reported. To be on the safe side, elaborate more on your thoughts, and try to stick to the topic.