We are not computing engagementWe take average reach from the channel's last 30 posts and subscribers as of today. Here a post has more views than the channel has subscribers at all: those views piled up over longer than the current audience has existed. Dividing one by the other is meaningless, so there is no ER and no reach verdict.
According to Telegram: 389 photos · 253 videos · 34 files · 481 links
