True CPTSD as diagnosed over time by a clinician is the result of complex traumas (complex, specifically, as that’s part of the definition. It’s what the C is for). The term is valid in that context.
In common social media language, even the term CPTSD has become diluted. It was intended to represent complex cases of PTSD which were edge cases, and correspondingly rare.
At some point the social media version of CPTSD emerged as a generic term and nearly everyone who self-diagnosed as having PTSD started upgrading themselves to CPTSD.
The comment above is right that “trauma” has become so generic as to cover everything stressful or saddening in common vernacular. The concept of CPTSD was supposed to be a step above even normal trauma, but now even CPTSD is being brought out as a generic term for any post-trauma response, which was never the definition of CPTSD.
A similar trend is happening on social media with the ADHD influencers now upgrading themselves to “AuDHD” which they say is a special more difficult variant of ADHD combined with Autism. My friends in psychiatry are at their wits end with all of the people coming in and demanding Autism diagnoses or “AuDHD” diagnoses despite not showing Autistic traits at all.
There’s an arms race going on where some people try to amplify experiences into something much more dramatic. These therapy and psychiatry terms start to lose their meaning when they get adopted by social media.