Speaking generally about 51% work/hashpower exploits in traditional blockchains (not just the re-org double spend instance of it): is it not true that once an attacker gains majority control over the consensus mechanism, they are then able to produce one hundred percent of the following blocks?

Reason I ask is because websites like https://www.crypto51.app/ quantify the cost to 51% attack for an hour - but if you can simply overwrite any forks where you do not produce every consecutive block it seems at attacker could start making profit rather quickly, assuming no one knew it was happening. Just wanted to test my intuitions against this community, thanks. Fairly dire outlook for many chains if true.

https://preview.redd.it/klq2doau0sy91.png?width=754&format=png&auto=webp&s=e3dddb9a95d0c56a29e4bce5d56c7fef1e41918c

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