Depending on how big the front end is, yes. Compare it with Twitter, there are some websites out there that index tweets that appear on Twitter. But because they have to appear on twitter first before they can scrape them or fetch them through an API, Twitter can't be hurt as they will always get indexed first (plus since it's a big tech company they probably have more than one support line with Alphabet/Google)

In this specific use case however you'd still need one front end that shows them first meaning that any of the other front ends would tumble down due to plagiarism checks. So than it becomes a question about which one to use. In the future I hope to see the block chain itself getting crawled by search engines and users on that search engine can choose in their settings which platform they prefer to be redirected too

Another issue with plagiarism is some of the apps and plugins that use Hive like the Wordpress plugin Steempress: https://wordpress.org/plugins/steempress/ users can use to cross post the content they put on their blog to the Hive blockchain but can choose to put a delay. That way they can always make sure that their blog gets indexed first by search engines

Not taken the latter into account (which is my biggest concern to be honest because I don't see a real solution for it). Putting some time and effort into making your content SEO friendly is really not that bad of an idea. While it might not pay of just yet, or not very well at least I do think in due time search engines will adapt to these circumstances