I get the same warning on my iPad. I looked at their record, and they do have a pretty high amount of incidences, but they are all based on what the google bots find scraping their unprotected files. You're going to run into a higher penetration rate on any site that uses a widely accepted framework (wordpress, sites that have tapatalk interface etc...) , sites that are not highly curated like this one is are bound to have users uploading infected files. If you don't download anything, there's a very small likelihood you'll acquire anything dangerous. I visit that site both on my iPad and on my computers and have had exactly zero occurrences.