With hindsight its maybe not fair how I reacted previously, as I have maybe a few pictures "stolen" which is actually something I am a bit proud off, while you seem to have a huge collection of professionally made pictures with real models (who require payment). So its quite easy for me to say that you should realize things get stolen as soon as you post it, as my pictures were made for free and as a hobby while you sink money into it. (i only just realize that as i was not really familiar with your content: the types of rainwear you like are not really what i like so i never paid too much attention who made the pics or where they came from).
And i am afraid that the content stealing will only get worse in the future. Pinterest is already notorious for stolen content, you can find articles about that if you google, and software is getting smarter by the day to remove watermarks. I watched a video from "whiteout" on youtube previously going over watermarks and how easy it is to remove them, quite interesting talk (he is a rubber content creator)
https://www.youtube.com/watch?v=5NRDoaaCImU&t=
You already tried the subscription website road, and you found the issues with it. Maybe some other forum members can jump in and share their experiences also, as there are more content creators on this forum although some are mostly members to just post teasers and hope to get new paying customers. I can imagine them trying to keep costs down by being the model themselves and getting the pictures taken by their partner. Maybe they also use commissions or are just being able to carve out an income at the moment as none of their current customers is leaking their newest pictures all the time.