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?
I mean, it’s a FOSS community and the OP asked for FOSS. With FOSS the user has the four freedoms, the first of which (freedom zero) is unconditional. If something is FOSS it’s taken for granted that you can “run the program as you wish, for any purpose.”
In other words part of the point of FOSS is that the user doesn’t have to worry about whether the rightsholder approves of their use of the software. They have a copy and so they can use it because it is free software.
Edit: I remembered the keyboard specifically has an exception allowing for commercial use, but the point stands. If something is described as FOSS, open source, or free software then the expectation is that the user has those four freedoms. I think it’s worth it to stand up for the free software definition on principle even though I imagine most of us wouldn’t need to sell copies of a keyboard app.