Another growth loop which is interesting is making your product ultra-visible and distinctive - example Bounce scooters / Airpods / sent by Superhuman. You acquire a user, user uses it in front of many others, others find out and enter a growth funnel.
Disagree on growth loops being relevant only for tech online businesses. Offline/Brick and Mortal have the most basic and the most important 'word of mouth' loop. And an offline to online to offline growth loops can also be created.