We really need the lemmy version of a multireddit - some way to group up your subscribed communities into categories. This way you can lasso together all the communities that cover the same topic but were created on different instances. That’s at the basic level.

At the advanced level, I hope someone can come up with an algorithm to merge duplicate posts/news sources/etc together so that it looks like one centralized post, even though it is decentralized on the backend.

It absolutely can become a problem in the areas of advertising, politics, propaganda, misinformation, and scams.

Once out of the spotlight of the immediate popular phase (say, a month or a year after the initial post) and the greater scrutiny that carries, imagine changing the title to something anti-vax, or painting a company in a better light (Nestle did nothing wrong!), or endorsing a fake research result (global warming is not man-made and just a natural cycle!), or just flat out putting in a web address to a phishing site since you know someone’s grandma will click on it.