While we understand why you may want to do this, there are good reasons why we don't allow this. RapidFunnel is designed to be a person-to-person, warm-market tool.
The primary issue is that we don't currently have a way to keep people from abusing a bulk import function, if made available. Most users would call each person before putting them into a campaign, but that wouldn't stop some people from going through the contacts in rapid succession and assigning them to campaigns, rather than doing the work to contact them first. If even a few users did that with a large number of contacts, then our SPAM complaint rates could climb rapidly before we could mitigate the situation, which that would adversely affect every user in the system. We currently have a greater than 98% delivery rate for email.
While we know that most people would use this type of feature correctly, it offers too many opportunities for abuse. Any abuse of that nature would negatively impact all users. If we are able to find a way to prevent people from abusing a bulk import feature, we'll revisit it, but at this time, we don't have a way to do that.
Please see steps on how to Import contacts on the App: How to Import contacts on the App