Not true - from my experience. When I play random pubs crossplay, some 50% of the PC players do things, which surprise me. And to mention that too: this is not true for the PS4 players I play with or against…
By the way, this fact might also be the real source of the “cheats or no cheats” debate going on quite often in this forum…
And note, that I do agree to you, saying that most of PCs do not cheat (I might not agree to: there are no cheats out there at all, but that is another discussion. I absolutely agree that nobody should be accused to cheat without evidence and that said accusations are too often, but thats another discussion too…).
They just have the advantages that PCs have over PS4s in terms of controlling and viewing.