Since some users (eg for shopping) only need a VPN with little traffic, here’s the reference to 20 GB Free Data at Windscribe.

Important:
This freebie is only for people who either do not have one, or have an account with 10 GB of traffic.
For Windscribe users who were lucky enough to enjoy the 50 GB voucher:
Do not use this if you have the 60GB free coupon applied. It wants to take away 40GB and you only have 20GB per month.

First create a free account at windscribe with an e-mail address – that gives 10 GB of traffic for free.
Then log into the account and enter the voucher code EXPAND20 under the item “Account Status / Claim Voucher”. This will increase the 10 GB to 20 GB free traffic.

How long the action lasts, I can not say. It is also unclear whether the 10 GB additional traffic is limited to one year.
And of course, the choice of servers remains very limited (as with most other free VPN offerings).

List of servers available for free account:

US Central
US East
US West
Canada East
Canada West
france
germany
Netherlands
norway
romania
switzerland
United Kingdom
Hong Kong