They could send you up to 50,000 sats, but they will take form of fee credits - spendable only after linking your own node, or to pay for channels or Alby Cloud.

https://guides.getalby.com/user-guide/alby-account-and-browser-extension/alby-account/faqs-alby-account/what-are-fee-credits-in-my-alby-account