Hi @Danika C
Double opt-in will always lose some genuine subscribers. They forget to check their email, or it goes into spam for some reason and they miss it. You can mitigate that risk by highlighting the need to look for/confirm the confirmation email on the form’s success step, after their email submission.
However, double opt-in is the only way to prevent fake profiles (and incorrect emails from genuine subscribers) ending up in your list and ‘subscribed’.
No, you don’t need to clone your welcome flow. When you add the profile filter ‘AND email does not contain +’, that filter is evaluated before each flow email is sent. So, fake ‘+’ profiles already in your flow will be skipped from any unsent emails.
Unfortunately, it’s not possible to run a custom flow report and include/exclude segments. That would be great to have though!
Regards
Andy