When you say, "it'd be too obvious...", I don't understand what you mean. Is there some reason to be concerned that she would be able to trace the video back to "that guy, called Mordred3, that I did half a dozen custom videos for when I was offering customs back in 2021"? Even if she knew your full name, date of birth, your social security, and your mother's maiden name, she has no legal recourse with regard to copyright or anything of the sort. A transaction took place. She willingly recorded herself cock-teasing like she always does for an agreed-upon fee, and then sold the results to you directly. She has no reasonable expectation of privacy nor copyright ownership with regard to those videos, as they are not part of her subscription-based services; unless you literally signed a contract stating otherwise, she has no legal right to the videos after selling them to you (in fact, you might have grounds to sue if she was to recycle the videos meant for you by putting them up on her page, unless you had both agreed in writing that she could).
The only reasons I can think of not to release your customs here are: 1. You paid for them, they are yours, your own, your... precious. Fuck those other guys (Deagol/Caesar included). Fair enough; you own them fair and square.-- 2. You have an unfounded fear of repercussions (unfounded because there can be no repercussions unless you think she could track you down in real life and commit a felonious act upon your person), and-- 3. You wanted to see what it feels like to be her, drip-feeding lackluster content to the masses in bite-sized clips, and cock-teasing worse than Maimy herself. Ultimately, it's up to you, but the 4 second clip thing is weak tea, bro. If Maimy has proven anything, it's that using this method of keeping people wanting more has its drawbacks.
Oh, and the "big mouth" line is a weird brag, dude. You sort of "talked her into" making you customs as much as a john at the stripclub talks one of the girls into a lap dance. You had money, and she was offering. End of story. Cool story bro (this is me cutting you some slack in case you were wondering).
She literally can't do anything to him if he was to go out and sell the videos to any number of people on the street today (he could start his own Onlyfans page- Mordred3, if you're reading this and you like my ideas, I'll be your manager... for a not-insubstantial percentage). As previously stated, he bought and paid for them, he owns them. Think of it in terms of an SAT question: Subscribing to Maimy's OF page is to renting a car from Hertz, as buying a custom video from Maimy is to what? The answer is, "Purchasing a car from the dealer with cash." Mordred3 paid for the car with cash; he can drive it into the ground, resell it (taking into account depreciation), or he can give it away gratis to a local charity and collect the tax write-off (we are the charity in this analogy, and the tax write-off is our goodwill--pun intended).