Depends on the file format. There is compressed and uncompressed audio - some times the numbers just represent the audio waveform (e.g. .wav) - some times with lossy lossless compression. Most, but not all, video formats are compressed due to the data size

There are thousands of types of file. They all contain data as a long sequence of numbers, and how those numbers are interpreted depends on the type of file - text characters, floating point numbers, pixel colour information or compressed data

A few bucks from even a tiny percentage of users makes a massive difference. My only opinion is to go broad, rather than deep. Ie spread what you can afford around

I don’t know about your bedpost but those fasteners don’t look adequate to me. Especially into plaster board

Also Onlyfans economics follows a power law - so like 5 of the models will be wildly popular and making a fortune, most won’t. Like bands, actors and similar.

So throw a few dollars at your favourite open source projects