Additionally the “workaround” that someone provided still uses those connected services <...>
It literally didn't. All it used was API endpoint, which by definition is not proprietary.
“right to repair”
Right to repair is about ownership. If a company can take away features or product you paid for, you don't own it, you rent it.
For those not familiar with Fall of Oriath beta see: https://www.pathofexile.com/forum/view-thread/1897264
Lifetime support means "purchase of any top-tier pack ($440 or above) or people whose total lifetime purchases combine to $500 or more".