Lots of good answers already in this thread, so just pitching a couple of “not what you asked for but maybe interesting” thoughts: Have you tried CFL lightbulbs? Those don’t flicker and should be available in a wide range of temperatures. Regarding the headaches, imho it’s more likely to do with blue light/color temperature than flickering, unless it’s severe enough you can notice it even if just barely. In that case, maybe look into glasses with blue light filters, helped me a lot with screens and indoor lighting

It is so much worse. Humanfacing

Many higher-end keyboards run QMK, which is a custom firmware you can modify to make all kinds of customizations to your keyboard. And the best part is that it requires no client software, it’s all on-keyboard

There seems to be a gross misunderstanding of how everything works here. Any platform will need to provide data to authorities when “asked properly” - as in, receives an actual order from some enforcing body that has authority on the subject in question. No commercial company will fight the CIA in court to protect your data. The best you can hope for is that they minimize what kind of data they collect about you in the first place - in the case of E2EE, they will only have access to IPs and other metadata such as connection timestamps and nothing else. But all of the services you listed will collect at least IPs and most will do phone numbers as well. The only difference with Telegram is that they’re transparent about it. You can either avoid using commercial platforms altogether, or use them in a way such that data retrieved from them will be useless. But believing that “Signal will never give my IP to law enforcement” is delusional.