Why?
Is this it’s own identity scraping scam guised as identity protection?
Because they are useful, but the more well-known they become the likelier they are to be blocked by whatever website you’re trying to use. Hence a regular stream of new domains is necessary for them to keep working.
> Is this it’s own identity scraping scam guised as identity protection?
The whole point of those websites is for you to not have to give your real data. At best they get the same fake information you give the original website, so I don’t imagine it would be a particularly effective scam.
for some sites I had to try like 10 differents mails
There are plenty of websites that want your private data to view content but you are not yet sure if you want to become a regular user or if they will sell your data.
Most websites just want to give you a great experience or to offer you something that you value and may even pay for in the future. I have signed to plenty of those with my real email address.
On a separate note, Apple's Hide-my-email (and similar) services may reduce the need for these websites in the future.
I have always thought their business model was ads based.
There are also dozens of websites that host regular e-mail, convert movie files, are color pickers etc. It's a relatively basic service that gets used by a large amount of people