As said in the tagline, your service is grouped with others that serve _disposable_ emails. Safe use cases for services providing disposable emails are somewhat slim. If you sign up using a disposable email, and later the account ends up being less disposable than you thought, for example because it contains some personal data from you, then you're taking a huge risk in not either using an email service that's too-bi…
Yes, I agree that it can be a disadvantage to be grouped with disposable email addresses, we have aliases that are a decade old that are still forwarding emails.
With respect to the longevity of the company, it makes a healthy profit and due to my brother's great sysops work it is fairly low maintenance except when we're making improvements.
Also, our friends and family all use it, they'd disown us if we shut it down or sold it to anyone that wouldn't respect its users :)