Nobody is going to send a SWAT team to someone's house over a $25 Venmo transaction marked as "drugs". Not only is it not even close to nearly enough evidence for a warrant, but a SWAT team isn't going to get sent for drug possession in any case.
Being swatted is a thing, but it's not going to happen over a $25 Venmo transaction titled as "drugs". Or even one titled as "weapons". There needs to be actual intent to harm someone immediately declared. Last year's swatting was because the person claimed he "had fatally shot his father, and was holding family members at gunpoint."
Law enforcement is different than SWAT, so I won't even entertain your second anecdote except for saying in order for Interpol to get involved, they needed far more evidence than a Paypal transaction with that description.
What about do-gooders? Someone sees a transaction marked "for drugs" and they call the police because they think they are helping. This already happens to a lot of people holding cookouts, selling lemonade, cutting grass, and more.
Hardly "nobody".
Yes, by lying and saying there is a dangerous situation like a hostage. In the swatting incident from last year, they were called because the person said he "had fatally shot his father, and was holding family members at gunpoint."
SWAT gets sent out, sure. But SWAT does not get sent out for minor drug charges. They're called special weapons and tactics for a reason.
"SPOKANE, Wash. - SWAT raided a Spokane home on heroin warrant. It happened just before 11 am Friday morning at a duplex home on the corner of 4th and Altamont. Details were not immediately known but authorities on scene say they were serving a warrant related to heroin."
http://www.khq.com/story/21437261/swat-situation
How do police obtaining a warrant? In part by establishing probable cause. How is probable cause determined in the US:
"Probable cause can be based on either direct observation by the police officer, or on hearsay information provided by others."
However, I don't believe you are sincerely trying to understand my point: If probably cause can be established by, "hearsay information provided by others", Then the Venmo transaction information could result in someone being SWATed by a well intending citizen or a malicious person.
Therefore, the availability of this information on Venmo can be a contributing factor to someone having the police called on them (and the police responding). I am not sure where the hole in this logic is?
Sure they get called out for minor drug raids. For "practice." Especially in smaller locales where SWAT is needed infrequently. It's probably a bad idea, but it is what it is.