they 100% are NOT legal and free on archive.org and a number have been taken down when ever GW finds out.
White Dwarf is a copyrighted magazine and GW have NEVER relinquished that copyright. It'll be out of copyright and 'legal and free' a minimum of 70 years after publication date, mostly.
It is one reason this forum doesn't like or point towards pirated copies of stuff like that. Extracts are fine under far use, but White Dwarf is copyrighted and GW are well known to protect their copyrights. Every once in a while they notice someone misusing archive.org and have to take action, which really screws up Archive.org since they are a non-profit and it basically ends up costing them.
there are also a number of other issues with the collectors value being on cellophane.. no.. seriously, no... then you get them gits that think slabbing increases value.. well, it does for the companies which screw people over by doing it.