This is an interesting perspective, though I would argue that the internet has created superior substitutes. It's hard for me to see random encounters as entry points to friendship, acquaintances, or romantic partners, though I speak with a bias from living in a city. When buying groceries and running errands, I'm typically focused on getting in and out quickly; I'm not as receptive to talking with others. If someone is asking for directions, I'm willing to help out via Maps, but I'm also aware that the person might be trying to steal my phone.

Despite this, regular chance encounters are alive and well. You can go to the gym, hang out at a pub, or stay at a coffee shop. People are typically more receptive to speak in these contexts, all of which can't be replicated in a digital space due to the reliance on physical equipment (e.g. weights, exercise machines, drinks, and coffee machines). Martial arts in particular can really expose you to people of different ages, socioeconomic groups, and interests.

Outside of these, I believe that conferences and seminars are a good way to meet others, which the internet helps with. I can see technology making these in-person activities less intuitive (it's so easy to just spend time on social media), but if there's a will to see others, technology can help rather than harm.