Transfer basically costs $0 for them because they pay for capacity ("size of the pipe"), e.g. $0.50/mbps to their IP transit vendors. When cloud companies charge you for transfer ("stuff through the pipe") e.g. $0.1/gb, they're basically extracting "free money" from you. They want to charge you some minimal amount for transfer to disincentivize everyone filling the pipe, but they don't actually need to do that to cover their costs. Hetzner is taking an alternative approach of capping transfer instead of pricing it per GB.
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Transfer basically costs $0 for them because they pay for capacity ("size of the pipe"), e.g. $0.50/mbps to their IP transit vendors. When cloud companies charge you for transfer ("stuff through the pipe") e.g. $0.1/gb, they're basically extracting "free money" from you. They want to charge you some minimal amount for transfer to disincentivize everyone filling the pipe, but they don't actually need to do that to cover their costs. Hetzner is taking an alternative approach of capping transfer instead of pricing it per GB.