@quadland Having sites be suspended or being unable to sign up for a Netlify account is an increasingly common problem, due to systems that Netlify have put in place to reduce abuse of their system.
However yours is the first I’ve read where the account impacted is a Pro Account, normally if I see someone report that their paid account has been suspended, it’s because they’re in arrears and have exeeded 4 weeks of non-payment as per the Overdue accounts documentation.
Long support times for “Pro” and “Business” plans have long been the case, as Netlify consider them to be “self service hobbyist plans”, see the discussion in this thread:
Netlify’s direction as a company is to focus on Enterprise, as per the announcement by their CEO when they recently restructured.