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You like the music you like and that itself is as punk rock as you can get.

The difference between "Lookout! Green Day" and "Warner Green Day" is one of DIY vs Payola. These days, it's much easier and potentially more profitable to go the DIY route, but back then, you needed a sugar daddy to "make it big" fast. Taking the easy route meant Green Day were shunned by their original fan base (somewhat justifiably so,) but they had more energy, raw talent, and Buzzcocks hooks than anything else on top 40 radio with the exception of Nirvana (which is why Warner was trolling for talent in the first place.)

It's hard to call any "punk" bands sellouts after Nevermind. Were Hüsker Dü sellouts? They signed to Warner in '85 (almost a decade before Green Day.)

The music business is harsh. If you're in a band and into it for the long haul, own your masters and go the DIY route. Your fans will find you and are more likely to pay directly when they do. If you're in a band and want to make it big fast, consider this often cited article from Steve "Mr. Gold Bracelet" Albini on cashflow:

https://www.negativland.com/news/?page_id=17

There's a reason you're seeing a lot of live music. Streaming doesn't pay the bills.