I agree with both @Korina and @jpohorelicky. Windy needs an income, as for any company. But Windy also needs to be more honest and transparent.
"We've partnered with webcam.travel" -> "We paid a lot to acquire webcam.travel, as a clever strategic move".
"The other Windy App stole our name" -> "The other Windy App exists since 2016. We decided to take the same name in 2017 because it sounds great. And now we say that we are the real Windy."
"We need money for infrastructure" -> "We need money to pay for the data, the developers and the infrastructure."
We you talk it sounds like Windy is a DIY project run by a small team of volunteers. No. Windy is a startup company with great ambitions, with at least 10 employees and with already multi-million € of capital funding (from Ivo, indeed).
Anyway, there is nothing wrong about being a startup or offering a premium service, and you guys at Windy are doing a great job.

I think that the owners should accept that once they put some data here, the data that they already sent should be here forever. It do not think it will be a problem for producers to accept that, as it is a classical requirement. Otherwise it will be really difficult to manage the takedown of archive data, both for windy and other users.
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What happens if someone makes a png map of worldwide yearly temperatures… Need to remake the image everytime someone wants to get his data back? Do you see my point?

Of course, it's up to you. I am just trying to give some advice.

Cool for the API! Thanks!

I agree with both @Korina and @jpohorelicky. Windy needs an income, as for any company. But Windy also needs to be more honest and transparent.
"We've partnered with webcam.travel" -> "We paid a lot to acquire webcam.travel, as a clever strategic move".
"The other Windy App stole our name" -> "The other Windy App exists since 2016. We decided to take the same name in 2017 because it sounds great. And now we say that we are the real Windy."
"We need money for infrastructure" -> "We need money to pay for the data, the developers and the infrastructure."
We you talk it sounds like Windy is a DIY project run by a small team of volunteers. No. Windy is a startup company with great ambitions, with at least 10 employees and with already multi-million € of capital funding (from Ivo, indeed).
Anyway, there is nothing wrong about being a startup or offering a premium service, and you guys at Windy are doing a great job.

I think that the owners should accept that once they put some data here, the data that they already sent should be here forever. It do not think it will be a problem for producers to accept that, as it is a classical requirement. Otherwise it will be really difficult to manage the takedown of archive data, both for windy and other users.
.
What happens if someone makes a png map of worldwide yearly temperatures… Need to remake the image everytime someone wants to get his data back? Do you see my point?

Of course, it's up to you. I am just trying to give some advice.

Cool for the API! Thanks!

Shouldn't it be more appropriate to use a widely known license such as Creative Commons BY-SA or ODbL Open Database License for this community project?

Especially, this line seems very problematic and unenforcable: « Providers have full right to discontinue providing the data at any moment and require Aggregator and all Consumers to delete its data ». Why put this restriction? No other license do that.

Will you provide an API to access data form every stations?