I didn't believe your point about Gmail, expecting many companies to still host their own mail servers or use other services, so I went looking for some data. F

I didn't believe your point about Gmail, expecting many companies to still host their own mail servers or use other services, so I went looking for some data. Found [1], which says that Gmail has 34% market share and Microsoft Exchange 33%. GoDaddy is third with 15% and all others are < 2.5%. Contrary to my expectations, this does confirm that Google and Microsoft are quite close to a duopoly; I'd expected there to be many more providers still. Still, if Twitter would use ActivityPub I'd consider that a huge improvement. I can send a mail from my @outlook.com to your @gmail.com account, and I can send a text message from my Verizon phone number to your AT&T one; while apps like Twitter, Whatsapp, Messenger are all closed off. If Twitter would adopt an open protocol, IMO that would be a huge improvement, preventing lock-in, allowing users to choose between different UIs, having instances with slightly different features competing. (Also, regarding your last point, remember when Digg did a major redesign? Change can happen ;-) ) [1] https://www.datanyze.com/market-share/email-hosting--23 https://www.datanyze.com/market-share/email-hosting--23