The post already explains in painstaking detail why network effect requires us to adopt extreme measures (which you mischaracterize as "you're either with us or against us"). It's the nature of the conflict, and free software advocates must either recognize it, or continue to suffer the dominance of proprietary software.
The issues with Matrix are perhaps better explained by others, elsewhere.
As I wrote in the post, "meeting people where they are" is how we get free software organizations which use proprietary platforms for everything. This mentality must be avoided if we want to move away from proprietary platforms.
The issue is above all that bridging to Telegram (a proprietary, centralized service) basically amounts to normalizing and encouraging proprietary services. The poor UX of bridges is a secondary issue.
You're not the first person to seemingly have missed that I offered to bridge the XMPP room to the Matrix rroom, provided Telegram was de-bridged...I suppose it's not clear from my writing.
Thanks for reading and commenting.
Where did you get the idea that I'm against software which "costs money or is corporate controlled"? All my objections are to proprietary software (whether on the client side or the server).
(I am against corporate-controlled platforms, but I haven't mentioned that in the post at all...companies sooner or later mistreat users. I've linked to a number of examples at the end of the post.)
That said...perhaps you refer to my opposition to centralized platforms? Surely the anti-user characteristics of centralized platforms are well-known at this point?