I see a correlation between shilling crypto (a scam) and stupidity, so they probably struggling not with just Mastodon, but can be expected that they couldn't use email.
And if cryptobro is also fan of Elon Musk (98% propability), then it's sure not about "complexity", they will find a reason to hate Mastodon and praise Twitter under new management. I've seen a post, where Mastodon is bad because... it's created by russian german (since racism on twitter is now a "freedom of speech", you can make that shitty takes)