Who can spot the ethical issue here?

Referral fees permitted for lawyers

Attorneys can share referral fees with other attorneys, as long as they comply with the governing ethics rules. Under Rule 1.1 of the Model Rules, for example, “lawyers” can only refer to competent lawyers.

Rule 1.5 (e) specifically governs referral fees between attorneys, and spells out certain requirements, including these three:

1. The division is in proportion to the services performed by each lawyer or each lawyer assumes joint responsibility for the representation;
2. The client agrees to the arrangement, including the share each lawyer will receive, and the agreement is confirmed in writing; and
3. The total fee is reasonable.

https://www.attorneyatwork.com/is-it-ok-to-pay-referral-fees/