Anybody who’s looking for free static form provider, take a look at Sociocs: https://www.sociocs.com
It is much more than static forms, all bundled into one neat package. Free plan is extremely generous and sustainability will be built around future paid plans (existing features will stay free).
They are also developer friendly and welcomes feedback (for example static forms was built based on my feedback). One unique selling point is the review monitoring and option to reply to reviews on Google, Facebook and Google Play.
I personally find this great value, it is free after all