This kind of misleading pattern is illegal in Australia and from reading other comments, probably the Europe.
In Australia the full price for a product has to be displayed equally or more prominently than any other price. So that $6.93 has to be just as visible other pricing claims (like $0.99 for 4 weeks).
The same law also requires companies to include tax prominently in their pricing. More generally, a business cannot engage in misleading or deceptive conduct.
The rationale behind this is it makes things fair for consumers, and helps businesses compete fairly.
These laws probably don't exist in places like the US as businesses complain about compliance costs, and the governments have other priorities.
In Australia the full price for a product has to be displayed equally or more prominently than any other price. So that $6.93 has to be just as visible other pricing claims (like $0.99 for 4 weeks).
The same law also requires companies to include tax prominently in their pricing. More generally, a business cannot engage in misleading or deceptive conduct.
The rationale behind this is it makes things fair for consumers, and helps businesses compete fairly.
These laws probably don't exist in places like the US as businesses complain about compliance costs, and the governments have other priorities.