I want to make a list of biggest websites that run on specific platform. I won't mention platform here but let's say xy for example. So basically it will be a directory where each site will be described with couple of words and with a name and link.
Is there any risk that any company could suit me for this because I will reveal information which platform they use? To recognize that they probably run on xy platform I will check if a specific URL exists in their domain. Platform xy has specific URL key on all domains, that is how I know they run on this platform. This is actually public because everyone could do the same, but still I am not sure about legality of publishing their site on the list.