For me it was the fact that reddit was propietary and not privacy friendly and I found the lemmy app on fdroid and did research deciding to use it. My only problem for privacy friendly messaging apps or any apps is that sometimes the whole community is just pure privacy and you cant find chill groups or communities where people talk about anything(like element which caused me to switch to Tox which is much simpler to use)but lemmy actually has communities like memes and such that arent all about privacy