.Google.com's John Mueller suggests website managers on taking care of obsolete amplifier subdomains, suggesting redirects or total DNS removal.Mueller recommends either maintaining 301 redirects or even clearing away the amplifier subdomain completely coming from DNS.For web sites with 500,000 pages, crawl budget impact coming from legacy AMP URLs isn't a major concern.AMP subdomains possess their own different crawl finances coming from the principal domain.