These are what I would consider high-effort, low-reward marketing strategies. It takes a lot of time and manual effort to identify communities and pages where

These are what I would consider high-effort, low-reward marketing strategies. It takes a lot of time and manual effort to identify communities and pages where this activity should take place, and then to initiate the activity in a way that doesn't get flagged as automated/spammy. For your troubles, you may luck out and get some new followers who are mildly interested in your product, or some clicks that probably won't have high conversion rates. They may be "powerful" in terms of getting views or initial interest, but they likely won't be powerful enough to get people further down the funnel.