dragonX

Try this (sharing using wifi instead of bluetooth ):

• Install an opensource android app called trebelshot
• create a wifi hotspot on your android phone (with or without password)
  chose a dummy or empty doc on your phone (even a txt file with "hello world" in it)
• then on the trebleshot app click send > select that file > then click on "share on browser", the app will the provide you with a link like : 192.45.0.1:45665
• when a customer comes to your store, ask them to connect to your hotspot and ask them to visit that link on their browser
• the customer can then chose the file they want to share on the browser, and sent it to you using wifi

Hope this will help!

Having sealed sender only with contacts is an anti spam measure

I would rather deal with spam on my own than have a central entity monitor my communications ( as we can't verify if the signals servers aren't running a modified version of the open source release) + turning on sealed sender for me won't allow my messages to reach the other end if sealed sender isn't turned by default on the other end, should I ask every contact to turn it on before starting a chat with them ? that's a bummer for me ! a useless feature if it isn't turned on by default for everybody.

at signal they are working on removing the requirement for phone numbers.

It has been too years since they have announced that and till now its crickets ! and by what I gathered for forums and github It seems they are not getting rid of phone numbers for sign-up (they might still be mandatory ) but you might have the option to add contacts using their usernames (which is better but not what the community has asked for the most ).

I wouldn't hold my breath waiting for briar to get voice and video calls.
Its development is very slow. and It doesn't seem like the dev team have shown interest in bringing calls.

This²

A truly decentralized and private internet with no need of government, telco and big brother oversight

Well, they are more concerned about growth than offering a true private solution, they can't fathom scenarios were signing up using phone numbers will expose you to higher threats, as is demonstrated lately by government bans on signal account sms verification from Iran & china ..
them only activating sealed sender by default for only contacts, is another sign to how much they are attached to harvesting user's social graph and communications habits, + them not releasing the latest server version code adds to a lot of red flags.

Money has no moral !

Other countries would rather have one central social network to deal with, to ask for user data and send gag orders , rather than hundreds of thousands of intances.

Well (illegal content) could be defined differently by different governments.

• (LGBTQ ++++) is specifically in Russia illegal content.
• criticism of the state is illegal content.
• protest organizing is illegal content
• Blasphemy is in many regions illegal content.
• and many more
  IMO hammering twitter to delete C.P (that could even be planted by russian fake accounts) is just the beginning and not the end goal.

the problem here is discoverability! as it stands in all Fediverse projects fewer instances host the majority of the fediverse users. because without being able to discover threads of other instances from the one you signed-up to, those smaller communities will not be active enough and will end up duying.
We must think of ways of merging the feed form different communities of different instances so the user feels like interacting with one big universe rather than separate communities.

My bet is that Russia is working towards gaining more leverage on tech giants. this has been the same pattern with other tech giants. next they might ask for all data of Russian citizens to be stored in Rissia. then ask for easy direct access to it. just like the Prism program in the U.S!