Use your own relay if you do not want to depend on their servers to forward the requests:

• https://github.com/getAlby/lite
• https://github.com/getAlby/hub?tab=readme-ov-file#optional-configuration-parameters
• https://guides.getalby.com/user-guide/v/alby-account-and-browser-extension/alby-account/use-your-lightning-address/own-domain