User @QuazarOmegaalready pointed this out, it depends on the definition of free, of which I'm positive the majority of my list complies with. Moreover, I did apologise for including Spotify, and offer alternatives:
“Despite their free version forcing ads, the paid version is too convenient, sorry. However, their UXD has become more annoying so I'm not sure how long I'll stick… If cross platform functionality isn't a big deal for you then consider Tidal which pays artists significantly more [5], or BeatSense for simple YouTube playlists and listening together.”
If there are better alternatives—to anything really—please share them instead.
Regarding Vivaldi: Why isn’t Vivaldi browser open-source?
Lastly, about Mega and Telegram, I added “breaks rule 3” to their listing. Mega is just remarkably convenient too, and unless the populace suddenly turns geek and they find out about the Matrix protocol, I'd prefer they use Telegram en masse instead of WhatsApp.