GrapheneOS with literally call anything shit that Gaelle from Murena touches. If Gaelle made billions and gave away an entire billion to an opensource project, GrapheneOS would whine day in day out about it. If Gaelle donated that billion to GrapheneOS, it wouldn't surprise me if the disbanded or gave that billion away in order not to be associated with the money.
Attestation is definitely a tool to lock people in, but it has valid usecases that cannot just be ignored. For example, it claims to ensure that the device is safe, to a certain degree, from malware and tampering that could lead to security problems for applications on the device. Those claims are part of the appeal. Instead of writing pages of slander towards the developers of Unified Attestation and, what I can only describe as, losing their shit, why not be constructive. Propose alternatives, propose to work on something better, point to a group that could help work on something better, throw out ideas for improvements, etc.
A bit of drama is cute once in a while, but not like this.