“Support” is vague. Your link is unreachable to Tor users so I can’t see what it’s about.
I boycott Twitter wholly. Will not set foot there. In fact, it’s mutual. Twitter kicked me off their platform when I refused to share a mobile phone number. Thus I inherently support dropping TWTR by not consuming it.
It’s embarassing and very disturbing that the public sector (especially in Europe) uses shitty corporate exclusive walled gardens like Twitter and Facebook. When a politician uses Twitter or Facebook exclusively, they should be sued for free speech infringement. The #1 purpose of free speech is to express yourself to policy makers. When they use an exclusive gatekeeper to block some people from reaching them, it’s an assault on free speech.
Whether they do Mastodon or not does not matter so much. Would be useful if they did, but the real focus should be on just getting them off exclusive tech. They can work out for themselves that Mastodon is useful and inclusive.
People don’t have a right to use Twitter -- b/c it’s a private company that excludes people (e.g. people without mobile phones). That’s the first problem.
I heard a rumor that (like Facebook) Twitter was closing read access so only members could /read/ posts. Did that ever happen? Maybe not, because I was just able to reach a twitter timeline without having Twitter creds as a test. If that exclusivity plays out, then politicians will be writing messages that a segment of people are excluded from viewing. It would not be enough that they can be reached by other means. Politicians would also have to copy all of their messages to an accessible space somewhere.
It’s also insufficient that I can reach them outside twitter only by non-microblogging means. E.g. by letter. A letter is a private signal not seen by others. Microblogging is an open letter mechanism. It’s important to deliver your msg to a polician in a way that the msg has an audience. Take away the audience and you take away the power of the signal.