This is just Google being a jerk. It's an extremely common behavior from them when it comes to their ad platforms.
Most businesses prefer to actually work with their customers, listen, and have a dialogue. Google's insular behavior goes all the way up the food chain to how Page behaves and operates.
I went through the sales processes for AdWords and Bing adCenter simultaneously and the difference was night and day. I could tell from the start that Google had zero interest in customer service and if something went wrong I'd be SOL.
Really? To me this is Google going 'why are dozens of accounts advertising the same URL with free coupons?' I imagine it happens quite frequently where people try to use free coupons over and over to never pay for adwords. They are cheating the system and ripping Google off. There is legitimate gripes about their non-responsiveness and poor customer support but their logic here is pretty cut and dry. It's also not malicious.
I don't think the terms of Google's coupon are that 'you can only use this credit if you intend to spend more than $100 long term advertising on our platform'.
If it were a matter of 1 user creating multiple accounts then they'd have a legitimate reason for closing the account. However, it doesn't sound like that's what's happening. It sounds like they're punishing people for using their coupon in a way they hadn't intended.
What's the difference between 1 user and multiple users creating accounts to advertise the same URL with free coupons from their perspective? It looks very fraudulent and appears to be cheating their system. It seems reasonable to ban such behavior when it's cheating.
Does Google let one account use more than one coupon? Certainly the terms of the coupon say one per account (I have read that because I did want to use more than one).
Most businesses prefer to actually work with their customers, listen, and have a dialogue. Google's insular behavior goes all the way up the food chain to how Page behaves and operates.