The biggest problem with replacing google scholar is that if you are not google, publishers will threaten to sue you for crawling their website and/or displayin

The biggest problem with replacing google scholar is that if you are not google, publishers will threaten to sue you for crawling their website and/or displaying information about their papers on your website. If you are Google you can just counter-threaten to delist them and stop crawling their website entirely. Google is unfortunately one of the only players that can actually offer something like google scholar.