I’ve found myself getting frustrated with the number of lemmy communities that are essentially just bots mirroring the respective reddit sub.

One that that has made me unsubscribe from several communities here is when they are just bot-lead reposts of the equivalent subreddit. This makes these communities on lemmy objectively worse than the reddit equivalent because there is not the population to interact with the sheer volume of posts, and it just becomes spam without engagement.

Also in the sciences (I’m a geologist), Megagram is often used. Most recently I wrote a paper which included discussion about the amounts of Mercury in the atmosphere, and Mg was the unit used.