It is a little tricky to remark on the "completeness" of the clients unless you explain what you mean by complete, even if that means from a technological perspective, as in including as many of the NIPS as feasible. But set aside that. There is another issue, vexing as it may be, is that, many web clients behave differently depending on where or which browser you access them, at least in my experience. Accessing coracle.social (not included in your list but is a very nice feature rich web client) on Firefox is different from accessing it on Vivaldi and different from accessing it on Safari. Safari in particular, is another issue altogether as you do not have lightning or Nostr signing add-ons (actually that's not true there is one, but not very intuitive to set up).

This is an excellent project but it can lead to a can of worms. At the least, please add a checkbox to make sure that the poster who is charging SATS for the uploaded content is allowed to do so, so that other people's copyrighted materials are not downloaded and made available for SATS collection at your expense. I know that you will have the signed keys for the person who will use your site to upload such materials, but anyone can create keys, including bots that will post and mine SATS on your site. So, somehow, you need to create a mechanism on your site that states that people are uploading either their own work or they are not stealing and selling stuff from others. Somehow those checks and balances need to be ensured.

Yes I agree with how you write it, (n number of independent notes and another note or chain of notes to define the links between. What I have in mind is a bot that listens to any link I place on a note and informs or edits or modifies that page to insert the linking note to it to build a list of notes that link to this note. This can either be in the form of direct edit or modification of that note or as a reply to it by the bot which then continues to edit that response. I am not clear on this.

Have you used Wirex or Coinbase debit cards ? Probably easiest to get started using cryptocurrency for fiat transactions.

:-), Thanks!