The easiest way to start a WhatsApp group is to have people write down their phone number on a piece of paper 
Now everyone has to type a random 25 character link. That's not really faster than writing down a phone number you know, is it?
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its even easier: put your phone in the middle and allow them to scan your qr :)
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With which QR scanner? The one they just downloaded from the App Store?
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