Have you been paying attention to what's going on in Iran?
Iranian discontent with their extremist leadership is a permanent fixture - a massive portion of the population has never been confortable with that rule and has only submitted due to the strength of the state apparatus. Their presidents come and go and popularity of said presidents ebb and flow, and Khamenei himself is not particularly charismatic and lacks the popularity that Khomeini had. They have a constant tradition of anti-government protests - 1994 (Qazvin protests), 1999 (student protests), 2009 (Green Wave protests), 2011-12 (Arab Spring / Day of Rage protests), 2017-2018 (economic/political protests), 2018-2019 (general strikes), 2019-2020 (Bloody November protests), 2021-2022 (water shortage protests), and now the Mahsa Amini protests.
As I pointed out already, Russia has two elements that make such a movement more difficult. First off, Putin has been more successful in building his cult of personality and positioning himself in a large portion of the population's minds as the only plausible leader of Russia. And second, Russians just seem psychologically to have very little hope that anything will ever improve in their country. This is demonstrated by the very fact that this is the 9th major protest movement in 28 years for Iran, but Russia has had.....what, those 2011 protests and then....?
And even Iran, after all those protests, has gained little. Like I said in the actual protest thread, even though I wish to hope for more it's definitely led me to be pessimistic whenever I hear that another Iranian protest has sprung up.
I'm not saying that Russians shouldn't protest. But it's obvious that the vast majority of Russians, no matter how strong their dissent, don't believe that their countrymen are going to protest alongside them, and thus any regular citizen's attempt to start said protest is going to be viewed as a suicide mission. It would be easier for dissenters to build momentum against Putin from outside Russia, where information is accessible and they're relatively more out of Putin's reach.