No, not really. unless someone purposely takes the bottles down and tampers with them they will not becomes significantly contaminated and are just fine to use.if it is on the wall - germs can travel into the bottles
so use your own
Highly unlikley to cause you any kind of problem even if they did.For me it's the thought that some people are wiping their butt then putting that same towel over the dispenser and pumping out more soap on the same towel. My thought is more so of the germs on the actual spout. But hey, that's just me.