Been using a degoogled LineageOS phone with all apps being exclusively FLOSS. My favourite free alternatives to proprietary apps and services must be Lemmy (Jerboa) for Reddit, ArcaneChat and Matrix (Extera) for Telegram, Fluxer for Discord.
Which ones are your favourite?
Thumb Key is my favourite! Using it right now. Very interesting to see its idea of using swipes to type additional characters implemented in traditional qwerty layout. Thumb Key isn’t the best for terminal, so it might be a good compromise.