I wanna reuse one of these plastic bottles to use them as dispensers for oil, vinegar and other condiments since their cap is so handy.
However, I read on the back of one of these "DON'T REUSE", now I wonder, is that just some kikery to get me to discard a perfectly viable bottle and get me to waste money buying more, or are there actual risks involved with reusing bottles such as these? I'm inclined towards the former but am curious to hear your take on this.

Currently I have the bottle I just emptied soaking in my kitchen sink with some water so as to let it more thoroughly rinse away the original contents, before I put in the actual condiment I wanna use it for