Could not be more false. And will continue to be even more false as time continues.
These offers disappeared because they spun numerous lawsuits in the US and not to mention in CA (internationally aswell). Regardless of offer terms, the advertiser is 99.999% of the time forcibly taking the user's number and opting them in without any user interaction. These are powered by means of MO (multiple opt in). The user must enter their number, and physically text a shortcode verifying they want to be enrolled/billed. Even then, the service of the "app" being downloaded, does not compliantly fufill any product/service related to the means of billing (PSMS). These apps have been deemed on the same premise as computer hacking.
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Almost unanimously, Carriers do NOT allow this type of creative/offer/flow. It's a matter of time till their billing codes get shut down (1-2 months, 3 max). At a $4 payout with ZERO scrub, it would take the advertiser 8-12 months to break even. If you see an offer live for longer than that, chances are they are turn and burning until they're completely shut down.
Again, wildly incorrect. These were big over a year ago. Be weary of anyone stating they "own" or have these offers at this point in time.
PS: forgot to mention, there's 3 current class action lawsuits launched towards advertisers in this space. PSMS as a whole will take another devastating blow across the board, deeming even less viable as a business/marketing solution.