Here are various tools (things) that are “harmful”, meaning that they are harmful specifically to the user and should therefore not be used, and some alternatives that should be pursued instead.

All of these claims are backed up empirically and are thus completely correct.

Harmful things Less harmful alternatives
LaTeX Pandoc Markdown, groff
VSCode, Atom, Sublime Text, Eclipse, Netbeans, Geany, Notepad++, Kate, Notepad, Textedit vi, Vim, ed, cat, echo
Discord, Skype, Teamspeak, Telegram, Matrix, WhatsApp, Facebook Messenger SMS, IRC, email
Windows, MacOS, GNU/Linux, Plan 9, 9front, Solaris, FreeBSD, Haiku, GNU Hurd OpenBSD
GNOME, KDE, Budgie, MATE, Cinnamon, Enlightenment burning to death in a volcano
i3wm, dwm, MonsterWM, bspwm, awesomeWM, FrankenWM, herbstluftwm tty
C++, C, Python, Java, Ruby, Scala, Scheme, Kotlin, Rust, Go, OCaml, Haskell, JavaScript, TypeScript, C#, SQL, Dart, HTML, CSS, Node.JS, Lisp, Pascal, Objective-C, Perl, PHP, R, Swift, Bash, XML, MATLAB, Octave, Coq brainfuck, binary, a Turing machine, MIX as outlined by Donald Knuth in TAOCP
PowerPoint, Google Slides, LibreOffice Impress suckless sent
Alacritty, Kitty, lxterminal, suckless st tty
Spotify, Apple Music, iTunes, YouTube Music, Deezer, SoundCloud, Qobuz cmus, mpv
SymPy, Sage, Mathematica, MATLAB, Octave, TI-Nspire CAS Xcas/giac, APL, paper and pencil
Steam, Epic Games Store, Google Play Store, App Store NinjaKiwi.com
Jekyll, Bootstrap, Hugo, PHP, Wordpress, Squarespace, WIX.com HTML and CSS
Git flash drives in an envelope
Chromium, Google Chrome, Vivaldi, Firefox, Opera, Edge, Brave, Safari, suckless surf, links your local library. go touch grass
ℝ, ℚ, ℕ the surreal numbers
ℕ = {1,2,3,…} ℕ = {2,3,4,…}
social media vocal chords
the Beatles the Kinks
soup being a food soup being a drink
Nvidia AMD
\emptyset \varnothing
\epsilon \varepsilon
Microsoft Whiteboard, OneNote, Noteability, Krita, GIMP, paint.net, Photoshop Milton
Inkscape xfig
Lenovo, IBM, Razer, MSI, HP, Dell, Apple, Gigabyte, Clevo, Microsoft, ASUS, Huawei, Xiaomi, Samsung Acer
Blackboard, Canvas, Aspen, Google Classroom static HTML
Arch, Slackware, Ubuntu, Manjaro, Fedora, RHEL, openSUSE, Parabola, Solus, Gentoo, Deepin, Mandriva, MX Linux, Mint, Pop! OS, elementaryOS, Garuda, Zorin, Mageia, Void, Tails, Artix, Alpine, CentOS, Rocky, antiX Debian stable