The people you really need to be worried about when it comes to torrenting if you're downloading illegal content, are anti-piracy groups. They will reach out to

The people you really need to be worried about when it comes to torrenting if you're downloading illegal content, are anti-piracy groups. They will reach out to your ISP, and if they don't comply, they will sue them to comply. Most ISPs (at least the big ones) don't care enough to lose money on a lawsuit and they'll rather easily comply. Changing your IP daily is not meaningful within the context of piracy on torrents.