"If RAVEC felt the level of threat towards them was such that Harry needed 24/7 security whenever and wherever he was in the UK, he would have it. He doesn’t though So clearly, the level of risk is lower now he’s no longer a working royal. The fact that he and Meghan generate a lot of newspaper comment isn’t what matters here - newspaper attention obviously does not equate to security risk."
And even if it did exacerbate security risk, if they were that worried then Harry and Meghan probably should stop courting worldwide attention and controversy, directly or indirectly slating the RF, racking up court cases airing their dirty laundry left right and centre, and having heavyweight retained PR support to publicise their every move. That's what generates the coverage.
If they stopped all that then the press coverage would significantly reduce almost overnight, and within a fairly short time they could fade into blissful obscurity. And if people didn't know where they were or what they were up to, then no doubt any risk would also be much smaller.
And of course the other thing they could do is give up their titles, not have (very recently) insisted on Prince and Princess titles for their kids and distance themselves from royalty. If it's Harry's proximity to the crown that increases his risk level, then becoming a fully private family with no Royal titles would certainly be a significant help.
But of course, they don't want to do any of these things - if anything the opposite. Which makes it clear that it's all about status and not at all about genuine concern for safety.