I really hate the inconsistency of volume/loudness on Youtube. I'll be watching a video then boom, 2 or 3 times louder, a commercial pops up. I constantly have to lower the volume during commercials and then have to increase again for the video.
Does the law for TV not apply to Youtube? Is YouTube not an MVPD?
For reference, the CALM Act is the law governing this: https://www.fcc.gov/media/policy/loud-commercials
No Twilio.
Long answer: most YouTubers are not properly mixing their audio so that it'll hit -14 LKFS (which is the de facto target loudness for online content. Most movies and television shows are de jure targeted to -24 LKFS/-23 LUFS. LKFS and LUFS are perceptual volume measurement scales, LKFS being predominant in America/SMTPE while LUFS are predominant in Europe/EBU.), either due to being intentional (ASMR content) or not knowing how to do it.
On the other hand, most advertisers have the backing of professional mixers, and they will hit -14 LKFS constantly, period.
Note that Youtube has a loudness normaliser - but only for videos that is significantly louder than -14 LKFS (you wouldn't want ASMR content to be NASMR). This is only done so that poor speakers won't be blown up and not get the ire of EU et al. due to popped ears.