Strike. They can deposit to the Strike app from a bank account and swap to BTC, there is a fee but they have levels and fees go down depending on the traded ammount. After thye swap to btc they can send to your(any) LN or onchain wallet.

Thanks for your suggestion, i asked to be added to "nostrapps" without success but its ok, i will just keep building all the stuff that i have in mind, if its good people will eventually use it, if not then its because its not good/usefull. I will just keep pushing until people use it :D

following @k00b comment, on mobile the links look like a single link, so leaving it here a littler better hopefully:

https://chromewebstore.google.com/detail/oblisk-sync/jbjbhombfpkgggbghnjgdigbkflocmlk

https://github.com/obliskapps/oblisk-sync

Hashrate will always find an equilibrium according to btc price, this means network security will always be adjusted according to network total value. No worries.