Myspace CAN take you off of their site if they detect a sample.
I have sampled tons, but I never make it obvious, I dip the sample in effects and distort it or bury it in ways that no one will ever know what it originally was -- if you do that, then they probably won't detect it.. but if it's a very obvious sample, then yeah.. it just takes one person reporting it and they will remove your page in a heartbeat.
This DID happen to me, not because of a sample in a song but because I had an image from Dawn of the Dead someone made for me and they did all this weird glitchy shit to it and put "scissor shock" in it. Someone reported I didn't own the copyrights to the image, and they deleted me without warning a few years ago. Honestly though, I see bands sampling artists and use images they didn't own for a few years now since then so they may have lightened up.
I'd still be cautious though.
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