if a quantum-capable nation state is targeting you, PQC is the least of your concerns. it is, imo, a nice-to-have with the current state of things.
as for qubits, it is hard to tell how they're growing at this point. it is purely speculative and i reckon the public perception of growth may be influenced by marketing.
PQC would be ideal, and it isn't all too hard to use an existing implementation. but the fact that a messaging service doesn't have it isn't at the top of the list for required features to protect your privacy against big corps.