We noticed around 7 websites which with domains that were just recently registered (with privacy protection). They are using our website keywords/titles and brand name and the sites are mostly porn / junk sites. They don't link to our website directly but use a javascript onclick redirect which is why we think we aren't seeing them in our backlinks report.  We've been in business for over 12 years and haven't come across sites like this before.  We recently lost our first page rankings for a few of our highest converting key phrases and have been digging in to possible causes. Just wondering if these sites could be impacting our results, and how to figure out if there are more like this? Examples: nesat.net
flowmeterdirectory.biz
finnsat.net
dotsjobs.net

Is there any reason NOT to code in tables (other than it being outdated) for SEO reasons?