as aStonedSanata mentioned, different tech isn’t what we’re talking about: fibre shouldn’t be limited to the speeds of, say ADSL or cable to keep things neutral

what we’re talking about here is, for example, netflix paying your ISP to prioritise traffic to their service over other services… this causes an enormous disadvantage to new startups, because they likely can’t afford to pay a similar fee or even enter into complex agreements with every carrier! in which case, netflix has a better service not because they’re better: just because they’re incumbent

of course these kind of things happen all over the place, but it’s the exact failure of capitalist systems that governments should seek to patch with regulations (like net neutrality) because it’s not good for consumers, the economy, or innovation… which are all the very things that capitalism is meant to promote!

New technology is not fast lanes like you are implying though. It’s functionally different equipment. Running services is relatively cheap but expanding them and installing new technology like 5G requires a lot more physical equipment due to 5Gs lower range. So it does indeed cost more. Atleast initially and most likely continuously as it requires more physical equipment. So more failures innately.