On his Twitch streams this issue was constantly brought up. While the frequency of discussion was obviously highest around the time of the accusations, it was brought up in basically every single stream, all alongside the very visible decline of his overall 'wellness' over the past ~2 years.

This [1] is from his final stream, and it's clear he was already at the breaking point. I feel most awful for his friend Bortnyk (one of the two voices you hear in the background there essentially having an intervention), he's going to be beating himself up thinking he could have done more, for years to come.

Everybody could see Danya deteriorating, but somehow I think nobody really realized just how 'real' it was. Magnus, who also regularly followed Danya's streams, has mentioned that he somewhat regrets not coming out publicly in defense of him. Probably in part because his views on cheating were already somewhat tainted at this point, and probably in part because nobody wanted to be the next person Kramnik started going after.

[1] - https://youtu.be/112JImX_cWM?t=8071