[LamaOfRuin]

>Nowadays, it seems that consumers converge more and more on a single brand for any service/product, which is probably due to the internet/social media.

This only seems true (at least over medium to longer times) for certain classes of product/service, namely those where network effects actually provide real value to consumers. Many products have tried to artificially integrate features that would initiate network affects (for example niche social networks for fitness trackers) but they end up making the product less usable because they're not part of the core value proposition consumers are looking for with that product.

[sharemywin]

usually "free" products where the consumer is paying in time watching ads and the user can't determine easily how much the "value" actually has changed. ie. no ads --> lots of ads