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Their data starts from Jan 1, so it's biased to underreport breakthroughs as a fraction of cases (since initially very few people were vaccinated), and doesn't show the impact of Delta.

This is extremely misleading, and not addressed at all as far as I can tell.

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Strong concur. If anything this data collection, once you see the issues, inflames my own suspicions the vaccine is now far less effective, be it through time or evolution. 5% breakthrough hospitalized with data spotty, out of date, with underestimation by vaxed whom died with Covid not being counted 50% of the time. Vaccines work, even this one did originally, but as of this generally months old data, it's showing to be less effective.

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