The thing is that I'm not worried about the criteria - I'm not a criminal, I've worked here until going on maternity leave and have not claimed benefits (not sure if that will mean anything for the application), I own a business here with my DH and by the end of the transition period, I will have been here for over 5 years.
However, my worry is that the people in charge of processing the applications will make mistakes. They're not perfect - they are human beings, and if looking at the track record of departments dealing with applications and similar, mistakes are made - and it could happen to anyone.
If an application is rejected, will an appeal be sorted before someone is deported?
If we were to end up with a no deal scenario, what's to say that the UK will allow EU nationals to stay in the future? Maybe they'll change the terms over time?
Even with T.May's deal, our rights have changed from being welcome here without having to pay or apply to stay, to now having to apply to stay, with a risk of rejection. That's a really unpleasant situation to be in.
My FIL voted for Brexit, and he told me that he wanted to get rid of foreigners, (but obviously not me). He told me that nothing would change for me and that I was being stupid for thinking otherwise - but things are changing for me (and everyone else).
There are EU nationals who have lived here for decades and who have older children who will be uprooted if their applications were to be rejected.
A few weeks ago, I talked to an EU national who has lived here for 15-20 years. Her children are born here - one child has applied and been granted a British passport, the other child has applied for a British passport, but it has been rejected.
On top of that, there's been a rise in EU nationals reporting that they are feeling depressed, anxious, that they are suffering with panic attacks and that they are feeling suicidal because of the uncertainty of Brexit.
I am finding it utterly unfair and inhumane to treat people like this.