Hi,
I friend of mine bought recently some BTC from ATMs in Switzerland.
Because Switzerland has a limit of 1000 CHF per month without KYC on ATMs,
he bought 10 times 1000 each, with fake phone number.
He wasn't money laundering, just using his own legal money for HODL,
while he didn't want to do KYC.
Now he is wondering whether he might get problems cashing out in the future.
Well, by virtue of the decentralization of Bitcoin, he might still manoeuvre his ways without getting into trouble but despite the fact he is not a money launderer, using fake phone numbers is against the law, it is bad and he might want to prove that to the law enforcers that he didn't actually launder the money if he is caught. Instead of using fake phone numbers, he could have used friends' or family's phone numbers with their consent. The 1000 CHF is still not a big money for a trusted friend or family member to be harming him in a good country like Switzerland.