Admin team of LGBTQIA.Social Mastodon instance received abuse email from Russian censorship agency, where they demanded to remove an account. The account in question represented a small group that ran a collaborative blog for LGBTQIA youth and adults in Russia.
Shortly after refusal to comply with agency’s demands, the instance was blocked and is now unreachable from Russia.
All previous blocks of Fediverse instaces in Russia were related to hosting CSAM.
It’s always IP + DNS + Deep Packet Inspection. To access blocked websites, you have to use some sort of proxying.