Qubic claims it now controls most of the Monero hashrate.
Users are now worried the company may be able to execute a 51% attack to rewrite the Monero blockchain or censor transactions.
The company called the takeover a proof of concept and experiment.

Qubic Performs 51% Monero Network Takeover Demonstration | Qubic
Qubic Performs 51% Monero Network Takeover Demonstration

(qubic.org)