What ever happened to phone farms? Are they just not worth it anymore?

I remember back in college I had like 5 phones running swagtv and perk TV and would net like 20 bucks a month. Are there still things like this? Or is it just a found memory now.

submitted by /u/Fine-Mousse-9584
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source https://www.reddit.com/r/beermoney/comments/1hknoq6/what_ever_happened_to_phone_farms_are_they_just/