I've never come across it before this post was made. It's only a matter if it catches on or not, just like how tornado cash was there for a long time, until it wasn't anymore
Actually I think that thanks to Bitcoin coming first and being bigger, Monero is able to rise in its shadow, because bitcoin as a crypto people use is like giving governments a safe environment of still being in control, with its traceability and ASIC mining by corporations that can sanction addresses and etc, if Monero was the first ever cryptocurrency it would be way more regulated and attacked as a tool for criminals and would never reach mass adoption, so it's way easier to move from Bitcoin - the coin for social media and legal tender - to Monero - the anonymous alternative -, than from your regulated and enforced fiat currency to a "criminal coin" everyone is afraid to have, making it impossible to spend and use. If Bitcoin continues to grow, so will Monero
there's way more to those crypto than just privacy, Zcash for example is moving to proof-of-stake, they also want tokens and smart contracts on their chain, while Monero is focused on also being more broadly distributed/decentralized, and harder to take down, with a CPU based proof-of-work to enforce that
to me it's because I see how it's properties are valued by the markets it is transacted in, giving me enough safety that I can find a p2p seller to acquire some Monero without being identified (no-KYC), which then I do not risk being part of data leaks and becoming a target of attacks, and I am able to move some funds to a cold storage, which means funds I don't need to touch or connect its keys the internet, as I know in months or years from now I'll still be able to transact those as I need them, as it retains its properties and all coins are always interchangeable no matter where they come from (https://en.wikipedia.org/wiki/Fungibility)
If anything, people have more to gain by being anti-monero than advertising for it. It's a stable asset, never goes up in price, hardly will make you a profit, so it is made for pure usage and protecting your freedoms