Those aren’t necessarily the crimes you think they are.
Firstly, everyone uses a VPN to get round the social media restrictions in Iran. Everyone. It’s completely normal. Secondly, alcohol free beer is freely available. Alcohol is hard to find - I have travelled in Iran (albeit at a time when tourism was encouraged) and did not see alcohol once. It’s very much an underground thing, as far as I understood.
For the poster above who accused her of “grinning like a loon” or whatever, Iran isn’t some dark land where smiling is banned. It is a beautiful country with incredibly hospitable people and we didn’t have any problems from officials while we were there.
But you DO have to play by the rules - it isn’t permitted for women to have their heads uncovered, or to sing and dance in public, you aren’t allowed to sit at the front of a bus and there are different attitudes towards women generally. Did I chafe against that? Yes, but I went there knowing it’s the rules and the price for breaking them can be high. Their biggest problem is that this couple didn’t play by the rules. As a Brit, you must have a guide who is responsible for you at all times - they didn’t do that, according to the BBC article. And you must be aware that bringing yourselves to the attention of the Iranian authorities is not going to go well, particularly at the moment. And travelling against FCO advice, because you believe in the goodness of humanity or something? Fucking idiots.