Caddy doing similar things left bad taste in my mouth, wouldn't recommend this approach to anyone. It's key-value API for gods sake.
Re:Volatile – A key-value pair API
by tendencydriven on Tuesday November 12, 2019 @04:36AM
(#21512803)
While it's just a key-value API it still incurs costs to the developer, there has to be some way for them to recoup that. Whether it's through advertising, or through donations (how likely are people to donate).
I plan to keep it free indefinitely. I'm already using it in two personal projects and I registered the domain for 5 years (a first for me, heh) so it's not going anywhere. If I have time I might eventually roll out some fun features that people might be willing to pay for, but for now I'm just focused on making it easy for people to store, change, and retrieve small pieces of data.
If you wanted to monetize, but still keep it free (of course, you could and should have paid tiers too), you could send back an additional 255 characters of ad-text, with the agreement being, "you use the free service, you are obligated to display the ad-text somewhere, if it's a web app..."
Advertisers pay for the ad-text.
You collect the revenue.
Wishing your service luck!