There are plenty of YouTube videos that go into the subject thoroughly. I couldn't find the one I watched recently stating the notion that the gospels ever could have been totally anonymous is absurd. Nobody would take you seriously, reputation was everything in the ancient world. The people of the time knew exactly who wrote what, even if there weren't any direct titles on the actual manuscripts.
So then who wrote Hebrews? It wasn't Paul's writing style, and it doesn't name it's author. Matthew and Luke don't name the Q source material they have in common. Let's take gMark, someone composes it around 70AD somewhere. It gets copied and sent to other communities elsewhere. Decades later it's attributed to Mark.
Reputation has never been everything & as crazy conspiracy theories like Qanon & antivax prove, some sizable fraction of the population will find a way to believe whatever they want to.
Sure. They had crazy conspiracy theories back then too. Anyone can believe what they want. But reputation means something today just as it did back then. It's just today we outsource that function to the academic system.
