There are more qualified SEO people here that can probably quote chapter and verse on SE rules … but my take on it is …
Google have ensured that you cannot be “Google bombed” or dragged down by Spammers that link to you … unless you’re silly enough to be linking back.
So I believe current “expert thinking” is that you’ll be fine.
Where they may affect you is if their sites come above you in the lists for the keyword or phrase you were targetting … but the quick check I did of Gamble4U showed you sitting proudly at #1.
:cheers: