I just applied for a cc in my wife's name, so now I can update this post.
Got three rapid-fire email alerts from:
• Experian IdentityWorks (possibly not free—might be from some data breach)
• Chase Credit Journey (free with some/all? Chase cards)
• American Express MyCredit Guide (also free with some/all amex cards)
I'd give those three the win. If someone applies for something in my name, I should know within minutes and hopefully be able to deal with it before anything significant happens.
I'll get more emails over the next few days and probably a few in a month or so from the other ones I'm signed up for.
Re freezing, if you rarely apply for anything, I suppose that's a good option, but there are drawbacks. My friend just told me that he wasted hours unfreezing stuff when his daughter was applying for student loans and he was cosigning. Although that may have been just him, since @steep-dog-55906 had no such issues (see below).
Also, keep your SSN close to your vest. Unless it's absolutely necessary, it doesn't go on paper or to humans or in emails. Only into secured online applications. Never on doctors' office forms (for multiple reasons).