From what I've heard, Suno is pretty faithful to the original. The instrumentation and some of the structure may be different, but if you've uploaded a song you've completed, there'll be no question that Suno's output has been heavily influenced by your original. Your original basslines, strum patterns, chord progressions, and melodies are weaved into Suno's output. Even with changes in style, your input is well represented.
Lyricists have a different problem. As far as I know, there's no legal precedent for someone stripping out the vocals and then claiming the instrumental stem is not protected by copyright.