Because just because you're ultra-hydrophobic, doesn't mean you're good at solving the problem of fouling.

The toxics are being phased out, but there's not much yet to replace them.
http://en.wikipedia.org/wiki/Biofouling is a very complex subject, with a lot of research dollars behind it these days.

The skinny of it is that many proteins will expose their hydrophobic cores and thus denature onto these ultra-hydrophobic surfaces; I'd imagine these surfaces to be excellent in pure water, and terrible in anything non-ideal (aka, the ocean).

P2OPP ?