A friend had the Fair Phone 4. It broke after a year. Hostile customer support, not worth her time. Idk. Stories of "good guy" indie companies who drop you as soon as you fell for their marketing keep piling up. It may be greed, short sightedness or an incompetent understanding of what it means to have customers, the results are the same. See Framework for another example of this.

Supply Chain is hard, Apple is the pro at it. Small companies struggle. Who are the founders? Are they experienced in hardware? They are doing something ambitious (keeping old stuff in stock costs money).

Just checked, as of now all the Fairbud parts seem to be out of stock defeating the entire purpose. Maybe they will get more stock once the sales kick off.

My Prusa Core One 3D printer has had two upgrades available at reasonable prices since I purchased it. These upgrade kits are a bit more involved than swapping out a battery or camera but in the end, I will have the latest hardware. They are a great example of "good guys" continuing to hold up their end of the bargain. I hope they make some profit from the upgrade kits because this kind of relationship is worth rewarding.