Apple gets a lot of (semi-rightful) flak for going their own way and developing their own tech, protocols, and connectors, but in many cases they were legitimately first and the 'standard' option came later.
-- Lightning pre-dates USB type-C, which fulfill the same usability goal
-- AirPlay pre-dates Miracast
-- Metal pre-dates Vulkan
In some cases, Apple's product was later adopted as the standard:
-- The mini-DisplayPort was their custom connector but later adopted as an official standard
-- the MOV format was adopted for the ISO base container format (MPEG-4 Part 12), which forms the base of MPEG-4 Part 14, commonly known as the 'MP4 container'.
In some cases, they did develop custom tech where open ones existed:
-- ALAC is fairly close in implementation details to FLAC, which pre-dates it.
-- Apple's 'HTTP Live Streaming' came well-after MPEG standard ways of doing HTTP streaming, and is roughly contemporaneous with Adobe's and Microsoft's proprietary ways of adaptive streaming. Later, DASH was developed as a vendor-neutral alternative, and is now the preferred way of doing adaptive streaming via HTTP.
I don't believe that Apple is any more proprietary than a lot of other companies. It's just that they're a tempting target, because they dictate their ecosystem so strongly, and it certainly doesn't help that they ship a lot of locked-down, premium devices.
But blatantly user-hostile changes like removing the headphone jack won't earn them any goodwill.
