Felipe first keep in mind that the MDB is paid, it is not 100% free, whereas the original Bootstrap is free. In green I don’t know much about licensing, and I don’t even know if someone would be allowed to charge for something that uses Bootstrap
Code Licensed MIT, Docs CC BY 3.0.
Then the fact that MDB is componentizado
does not mean that only it exists, you can easily find versions componentizadas
of Bootstrap for the frameworks most popular!
Or if you want a themed Bootstrap to look like Material Design (https://material.io/develop/web/) you have a free option here https://fezvrasta.github.io/bootstrap-material-design/
MDB makes your life easier because everything is already packaged, has paid templates and paid support, but if you don’t want to pay for it there are other options for you to "expand" the Bootstrap classes to other "themes" as is the case with Material Design. Bootstrap also sells paid templates on the official website https://themes.getbootstrap.com/, but has no option to support or pay...
I don’t think it has anything to do with taste. I didn’t really understand what you meant by that... Everyone is free to customize Bootstrap however they want. Already sell this modification on the market, or charge for something that is based on Bootstrap I don’t know exactly if it is allowed within the license terms of the code.
If you want a layout that looks like Material Design you can customize the BS for this, or use some of the options I mentioned if you need something componentizado
for some framework Javascrip.