You gave an example of 2 sentences. And if someone writes "Satoshi Nakomoto is a famous person because he created bitcoin". Is this plagiarism? As more and more material is written about cryptocurrency, the risk of creating similar offers increases more and more.
It would be possible since there are many articles regarding with the bitcoin or any topics that has been discussed here over and over again. But, it will still make a difference because we construct the sentence and paragraph in a different way. If it was being copied and paste word for word then it could be associated directly to plagiarism. But, if it is not then there could be a chance that an individual will become a plagiarist when his/her post and opinion has will has similarities with other's opinion and how it was being constructed. Yet, it would be the slightest chance that will going to happen. It would be a very rare case.