Can never figure out why the articles I see from Kashrus organizations about food deliveries ignore the obvious reasons that he points to to why it isn’t an issue.
A few points:
A) all these heterim are quite possibly בדיעבד there’s a disagreement among the poskim if נהנה בחליפין and מעבר לרבים are muttar לכתחילה or only בדיעבד and many point out that at least בעל נפש יחמיר (Rabbi Kallus clearly points out that he is talking as a בדיעבד not a לכתחילה setup).
B) There are several reasons why we can be חושש for נהנה בחליפין at least in certain situations 1. If the driver is travelling somewhere with no easy access to food he might eat it and replace it later 2. If the package gets totally ruined (and he feels that he’ll be held accountable for it) he might replace from a cheap non Jewish store .
C) מעבר לרבים might not always be applicable to these food delivery services drivers.
D)Most of the awareness by Kashrus agencies that I came across is concerning a totally different חשש that is that when someone is placing a order from a certain restaurant like McDonald’s or Bravo pizza for example that some specific locations are kosher there’s really no way to know if it’s really coming from that location without coming properly sealed and all of these reasonings don’t come into play in this situation.
E) The Kashrus agencies point out that in the event that it comes without or with a tampered seal you can send the mashgiach a picture and it could be muttar through טביעת עין.