Exchanges that are printing their own money (like Binance) are probably breaking some laws. The whole "altcoin" thing is just a big clusterfuck. I wish I NEVER touched any altcoins. It just makes your taxes basically IMPOSSIBLE to fill after you get involved. The damn coins die so you cannot access your wallet.dat anymore as the blockchains don't sync, the exchanges die and you lose trading history (in case that you didn't save it which is most likely the case). It's just a big fuck up. Im getting rid of any alts I still have, or maybe not even that, I will just let them rot, they have only given me headaches. If you try to convert any BTC to fiat, you are going to see a nightmare of impossible-to-fill taxes.

As far as people selling, you cannot stop them. What matters is, fiat tends towards infinite supply, Bitcoin is strictly limited in amount, so do the simple math.