Riot might be a great platform for doing business, but it's pretty useless for any other kind of activity. If you're a political activist having an app called 'Riot' on your phone or computer is not going to look good to anyone in law enforcement.
"having an app called riot" is the absolute least of an actual activists concern when selecting something to help them communicate. One of the most well known leftist platforms for email is riseup.
I'm aware of that, and I think flagging yourself by choosing such a branded platform is the height of stupidity. Maybe my social circles are just more privacy-oriented.