These are terrible sources. 3 random CVEs and opinions of randoms on the internet. The “sources” conflate arguments about systemd as an init system with the non-init parts and with criticisms of Poettering, and a lot of it is “this is bad” with no argument or, worse, incorrect arguments. If there is anything in there that actually proves something, link directly to it. I’m not going to shift through mountains of garbage to find it.