Because without some idea of doses by day, whatever is in those news reports or tweets could simply be wrong. The media and twitter are not perfectly reliable, after all.
It's a basic, simple sense-check, without which the analysis is meaningless 
-
This Tweet is unavailable.
-
-
Replying to @GidMK @c19analysis
As an example, HCQ was 'banned' in Canada but there are extensive reports of off-label prescribing even early in the pandemic. Maybe Canada should actually be in the intervention group!
1 reply 0 retweets 0 likes -
Replying to @GidMK @c19analysis
Here's a story from march that Canadian doctors were stockpiling the drug! Looks like early widespread use to me!https://www.cbc.ca/news/health/sanctions-canadian-doctors-experimental-drugs-1.5511244 …
1 reply 0 retweets 0 likes -
This Tweet is unavailable.
-
Replying to @c19analysis
Off-label use was common in the USA, UK, France, and other countries on that list as well. Like I said, without this basic sense-check, your group assignments are literally a total waste of time
1 reply 0 retweets 0 likes -
This Tweet is unavailable.
-
This Tweet is unavailable.
-
Replying to @c19analysis
Massive shortages of HCQ due to enormous increase in off-label use of the drug in the US in March. Definitely should be in the 'intervention' group by the criteria presentedhttps://www.washingtonpost.com/business/2020/03/20/hospitals-doctors-are-wiping-out-supplies-an-unproven-coronavirus-treatment/ …
1 reply 0 retweets 0 likes -
This Tweet is unavailable.
Lol, it's as good as any evidence you've cited. A couple of news reports of lots of HCQ is exactly what you've got for Algeria etc
Loading seems to be taking a while.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.