Pretty much 'a tale as old as time'
( sorry about that, I really had to use that line
Unless your OS has been given appropriate updates ( so sorry to hear that lately XP users' update and support has ended already
), that the user has been dutifully making sure that all his/her security updates are up-to-date, scanned their gear more often than noted by some ( especially any downloads they get from the Web ), and knows a bit of internet common sense ( 'don't click on obviously suspicious links' for starters
) then there is a bit of confidence that redirection won't be the least of worries
If you do feel that, for some reason that you know a person that had clicked your link so he/she would be your potential referral but ends up somewhere else, especially when they know you via email or text ( which is one way to keep tabs with your referrals ) -- submit a HelpDesk ticket and inform the staff to look into it ( there were rare cases of referrals clicking on a definite member's affiliate link, but end up somewhere else -- all solved by the Staff