Maybe, but there’s also a more long-term force in the other direction. Bringing content from other platforms to Lemmy means that Lemmy has more content and people are less likely to go elsewhere to get their fill. If the best of Reddit is available on Lemmy, why bother going to Reddit? It’s the same thing as how Reddit used to have lots of Twitter screenshots on it back when Twitter was worth screenshotting. The people taking the screenshots likely use both anyway and wouldn’t stop if they weren’t allowed to post Reddit stuff here.