Be that as it may.. it IS 'the way of the World', and an actress as aware as Ms Markle must have known it, or [at any rate] researched it, when considering her future - she CANNOT have been ignorant either of the Tabloids power, or their interest in the BRF [and anyone who married into it..
That suggests to me either she thought she 'could handle it', or that it suited a long term plan - to 'raise her profile' to the point where her ambition to 'change/improve' the World were possible, as it simply wasn't as an obscure actress in a Canadian Soap..
No, it's not the way of the world, it's the way of the BRITISH tabloids. We don't have a tabloid culture in the United States and I don't believe Canada does.
Yes, we have tabloids but they aren't our highest circulating newspapers as they are in the UK. Both the United States and Canada dwarf the UK in geographic size and because of that we have many more newspapers to choose from, therefore we do not all read the same newspapers, and one, two, or three newspapers do not dominate our media, as they do in the UK.
Believe it or not, contrary to what you seem to think, not everyone outside the UK pays very much attention to it, or even knows much about it, including the tabloids, the RF, or the tabloid's interest in the RF. They're simply of no interest to many of us.
Harry did discuss the intense media scrutiny with Meghan before the engagement and she has stated her friends warned her about the tabloids. But we don't know how seriously she took it, smitten and in love as she was.
But I do think the two of them should have found a way to deal with the scrutiny, asked others including the Cambridges, whatever it took. Some posters have speculated they isolated themselves & nursed their wounds, without turning to others for help. Unfortunately, I suspect that is what happened.