The Center for Human Rights in Iran has released a report outlining the effect's of that country's ban on Telegram, a secure messaging app used by about half of the country.
The ban will disrupt the most important, uncensored platform for information and communication in Iran, one that is used extensively by activists, independent and citizen journalists, dissidents and international media. It will also impact electoral politics in Iran, as centrist, reformist and other relatively moderate political groups that are allowed to participate in Iran's elections have been heavily and successfully using Telegram to promote their candidates and electoral lists during elections. State-controlled domestic apps and media will not provide these groups with such a platform, even as they continue to do so for conservative and hardline political forces in the country, significantly aiding the latter.
From a Wired article:
Researchers found that the ban has had broad effects, hindering and chilling individual speech, forcing political campaigns to turn to state-sponsored media tools, limiting journalists and activists, curtailing international interactions, and eroding businesses that grew their infrastructure and reach off of Telegram.
It's interesting that the analysis doesn't really center around the security properties of Telegram, but more around its ubiquity as a messaging platform in the country.