According to source the ecc has to ‘kick-in’ about 3700 times per year and dimm module. That’s 10 times per day and dimm.
Depending on how important your server is to you you’ll either need it (in case of important data you absolutely don’t want to lose) or forget about it (just a hobby project, nothing serious).
Xiaomi Mi 10T with LineageOS 19 (there’s no v20 for it) I bought it because I needed a new one that supports 5G and didn’t cost a fortune.
Next one might be a Fairphone 5 whenever it comes out. Or a Pixel with GrapheneOS.
I’m also interested in a mobile that runs Linux instead of Android (see PinePhone). But there’re none that have good/current hardware.
For now. But n the long run the focus will shift to profit. That’s a totally normal thing.