In general, I avoid most free trial offers but, when I do decide to take advantage of one, I use a secure card number generated online with my credit card company. Then, I cancel/disable that card number before the trial ends or before I elect not to renew/participate. The company/service couldn't charge me anything even if they tried.
Regardless, I definitely don't participate in those ridiculous 'sign-up for offers to earn something' scams.
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"Debt is the slavery of the free." ~ Publilius Syrus
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