Is it more common to see block letters nowadays, especially on the internet? For example, I've linked to a Twitter artist who (among many others) seems to handwrite in block letters in their comics. I was wondering whether this is the norm and, if so, whether this is a trend set by younger generations or only applicable in specific circles (eg. in comics and the like).
You basically gave a single example, built some conclusions based on that example and then asked a question based on those conclusions. There's indeed a trend for lesser use of cursive - or rather, for less strict rules for cursive, I'd say.
However in this particular case I believe there's no direct connection with this trend. While the history of comic culture in Russia is shorter than that of, say, the US or France, there's still such a thing as Russian comic culture. And, just like in English or French comic strips, cursive was not a thing in Russian comics either.
Here's an example of a Soviet comic:
That said, we can talk about at least 30 years of lettering traditions in Russian comics.