You probably won't get hacked and have your domain taken down for distributing malware. But you also probably won't be randomly banned by Google/Proton. Neither

You probably won't get hacked and have your domain taken down for distributing malware. But you also probably won't be randomly banned by Google/Proton. Neither feels like "full, unbannable control of my email" to me. If anything, I'm more concerned about my little old domain getting hijacked than getting banned from a hosted email account.