I'm not that triggered. Again, shitcoins are idiotic scams, but they pale in comparison to the fiat ones. So far, fiat shitcoins have done a lot to support Bitcoin's liquidity in the first place and nobody is crying against p2p echanges while they are also shitcoins casinos according to you.
Allowing people to top-up from shitcoin seems ok. At the end it's just about buying bitcoin. Swapping out for shitcoins would be cringe though, and would indeed start the shitcoin casino thing you are mentionning.