Can't say I've ever worried about that, and pretty much every designer I know has their work in an online portfolio.
For designers that we hire an online portfolio is pretty much expected.
Mostly im worried of colleagues that might steal my work to present it as their own in their portfolio! And 72lpi isnt really doing anything in that case
That could potentially happen, in 15+ years as a designer it's happened to me twice. And if it does, so what? There's thousands of projects out there online, if anything it's a compliment that they took my stuff and tried to pass it off as theirsMostly im worried of colleagues that might steal my work to present it as their own in their portfolio! And 72lpi isnt really doing anything in that case