>(heard instances of cloudfare being petitioned to take down content which is literally internet plumbing)
It's not, it's a private company. Most internet infrastructure is private companies offering their services under arbitrary terms, because that's the only possible way to have such an infrastructure without government controlling or regulating the internet, which we don't want.
And petitioning is free speech - people have the right to petition anyone about anything. There's nothing to be "relatively concerned" about here, except maybe the lack of competition in the DDoS space, but that's a free market issue, not a free speech issue. If too many people think Cloudflare has stepped out of line, someone will create an alternative, just as alternative right-wing platforms like Gab and Parler were created by people unsatisfied with mainstream social media.