I'd say the lack of Tor-exclusive easy-to-use applications. That Tor underpins an application should be transparent. If the Tor browser is the same on the outsi

I'd say the lack of Tor-exclusive easy-to-use applications. That Tor underpins an application should be transparent. If the Tor browser is the same on the outside as a web browser but slower, the anonymity alone isn't a good enough reason for many to use it. Rather, a (non-browser?) communication platform needs to compete on features and just happen to use Tor.