At my last company, we implemented a clause that was included on all contracts that permitted the use of their name, logo, and brief description of their use case for marketing/IR. Anything more than than (i.e. a full blown case study) would require a different release form
The terms were added by default to all contracts. If a customer pushed back, reps were able to remove the clause themselves directly from the Opportunity in Salesforce (no need to go through Legal for redlines)