Essential issue isn't about solving their problems. Essential issue is about making them more money. Which opportunity makes them the largest amount of money, with the least amount of risk to their investment?

Porn doesn't compare favorably to their other opportunities. Full Stop.

If it did compare favorably, they would be putting money and resources in porn.

One of the biggest examples of this is probably Tumblr banning and removing porn and other NSFW content from their platform.

The argument holds no water and it is pretty disgusting of this uber-for-porn pimp to pretend he is doing good. Porn is like weed. If you want to consume it ethically you need to verify your sources. These cam sites have their own serious exploitation issues that are completely being ignored.

If you go on reddit you can find many threads discussing cam girls who are suspected to either be underage or be literal sex slaves.

There are actual ethical porn producers of various flavours (also featured on HN quite a few times). Onlyfans is not one of them.

Like weed, which many people actually grow themselves?

Not all porn is created for sale. Modulo all the revenge porn stuff... there’s plenty of people creating their own “personal” porn. From candid selfies shared only with a partner to full on private amateur movie collections.