I didn't know the concept of domain/page authority in SEO until 1 hour ago. We have been blocking bots, crawlers, spiders and scanners in general directly from Apache through ModSecurity rules (custom rules).
We are only allowing bots from Google, Bing, Yahoo and other third party tools, but we block automated tools, risky countries (like Rusia, China, Ukraine, etc.), risky IPs and others since we've had negative traffic experiences and attacks in the past. Everything works fine now, but I'm afraid this can affect how some tools measures DA to all the domains we are hosting.
So, blocking bots affects DA results, like the ones in this page? https://websiteseochecker.com/bulk-check-page-authority/