The product isn't necessarily true (mobile -> landline push), but the profit-seeking is certainly expected, as it is for all businesses. While the amount of minutes & attentions that are generated from spam calls helps the telcos, because they get paid either way... that doesn't mean they're negligent. They just don't have the right tools to police this since they're common carriers. Things are changing little by little and with upcoming changes in telco infrastructure, I expect Q4 this year to show a strong signal of what the future holds.