I've always had some ideas about creating something similar to this; but i really don't see how you can market this correctly to people. If it's not decentralized most people will call you a "Scammer"/ think you'll run off with their "Investments". Which is why it's good that you fixed that issue, still, a lot of people will probably still be very suspicious.
You can buy shares of any internet meme by sending Bitcoin to an automated market maker (similar to the Bancor project, or what some people call bonding curves), which puts the BTC in a decentralized pool of reserves. Conversely you can sell shares back to the automated market maker to get BTC. This way, even for small memes there is always liquidity, and it allows speculators to make a profit by investing in the right memes.
How exactly do
you make money?
And; how is the market going to react to certain "memes"- apart from their popularity they have no ''function'' which will result in most if not all of them being a Pump & dump - your entire platform being a pump & dump.. -> Which will ultimately result in no one using/trading on your platform.
As a consequence, a healthy market of speculation around meme popularity ends up curating a list of which memes are popular right now, taking into account all the information the market uses to trade on (e.g. Google trends, Reddit popularity, mentions in traditional media, etc.)
This would be ideal, however i highly doubt this is what will happen. That'd be wayy to predictable.
Anyway, i'll be keeping an eye on this. Could be interesting.