zspotify VS FiraSans

what you want is ZSpotify, which will download songs from spotify itself in either MP3 or the original OGG format. it can do individual tracks or playlists, but you'll have to log in (a burner is recommended but i've never had any issues myself)

it is possible to rip from spotify (https://github.com/jsavargas/zspotify) or even Apple Music

How well does it compared to zspotify?

theres this one https://github.com/jsavargas/zspotify

Here is a fork of zspotify that can be used with docker: https://github.com/jsavargas/zspotify

There are two Spotify downloaders that I know about, first is zspotify which I know works for podcasts. Second is DownOnSpot which I don't know if it works for podcasts.

I think you might be taking the wrong approach here. You're right, some devices (anything that isn't Mac or Windows) don't have the "base 14" fonts available, but they don't need to if you just use embedded fonts in the generated PDFs. Any OFL-licensed font can be freely distributed with your app, and can be embedded in the PDFs generated by your app. Like all licenses you should read it yourself and not take my word for it, of course.

Fira Sans

A very pleasant detail with regards these typefaces, they are licensed under the Open Font Licence and are free (as in speech as well as in beer) to use.

Many free fonts on Google Fonts are available under the [Open Font License (OFL)](https://scripts.sil.org/OFL) and [Apache License](https://www.apache.org/licenses/LICENSE-2.0.txt). The OFL is very short and has some clear guidance on how the fonts can be used, so maybe that would be worth looking into!

Or should I better limit myself to use in CC BY PDFs only fonts that themselves can be freely redistributed, reused, remixed, such as those available under the SIL Open Font License?

This Font Software is licensed under the SIL Open Font License, Version 1.1. This license is copied below, and is also available with a FAQ at: http://scripts.sil.org/OFL

With the exception of Courier Prime, which is released under the Open Font Licence, there are no fonts "in" Scrivener. Whatever you see are fonts you've installed to the system or those that came with it.

To get Puppeteer to render emojis, you can use Noto Fonts published under SIL Open Font License (OFL) v1.1.

Fira Sans Medium: https://github.com/bBoxType/FiraSans

In terms of mono fonts that look like Comic Sans, I am surprised no one has mentioned Fantasque Sans Mono: https://github.com/belluzj/fantasque-sans

Fira is, to my eyes, an open source font which looks similar to Trebuchet MS, and there is the very popular monospace variant Fira Code: https://v-fonts.com/fonts/fira-code https://github.com/tonsky/FiraCode

Not to mention the original Fira Mono: https://github.com/bBoxType/FiraSans/blob/master/Fira_Mono_3... for a sample or https://github.com/bBoxType/FiraSans to download.