Mullvad has proved it doesn't collect. It's laughable to even suggest it.
They have been raided multiple times, tons of audits, does bleeding edge research on privacy preserving tech, donates to GOS, etc etc. You don't see this kind of VPN company at all because none exists.
Name any 2 or 3 that published bleeding edge research and similar in the last 6 months.
Well I can't think of even one at the moment, to be honest might be biased but all Chinese research labs are largely oss except Alibaba now.
I am certain there are lots of American labs that claim to do it, but either they are marketting in hype since they aren't even close to the frontier or contrarily just don't make anything of significant value public/oss.