This is a neat idea but the screaming bird sounds on the page, however possibly relevant to the service name, made me instantly close the site. It's loud and unpleasant.
A screenshot of a tweet is already a low fidelity capture (cf. a web archive). Why would I want to alter it further?
If I needed a tweet to look better than it actually does irl, I would screenshot something from Mastodon or Pleroma instead.
If I need to screenshot a tweet at a high resolution, I'm going to do this in any Gecko-based browser with <my own enhanced system font rendering preferences>.
If the screenshot needs to be larger-than-life, I'm going to use any of the puppeteer-based tools for this.
If I'm one of those godawful aggregators that needs square images with colorful patterned wallpapers behind the tweets, I have to use my library of cursed wallpapers and whatever shitware macro has already been written for the job.