It is operated by a profit-driven company that has previously given data to the police that has lead to incarceration of women seeking reproductive healthcare, and its CEO has already been at lunch with Trump in Mar-a-Lago. Plus the parent company is known for (best-case due to neglect only) supporting genocides, for example in Myanmar.
So this is just another layer of risk mitigation without sacrificing much, given that Signal and WhatsApp do a very similar job.