Though I more often select 1.25 or 1.5 playback speed, I enjoy well made long form videos*. I don't think people who will use this TLDR service are your voluntary viewer. It will be used in job or homework context.
Were it could become dangerous for content creators is when people use it to auto create YT-shorts or TikToks and call it fair use.
* In order not to feel bad about AdBlock and SponsorBlock I got YT-Premium**. I'm a YT-member on two channels and pay nearly 50€ a month with Patreon (Funny enough including your channel.)
** I almost rage quitted YT-Premium because these wankers collect Euros from a UK bank! So 2% foreign exchange charge is added! But many creators say the payout from YT-Premium viewers is more than from ad viewers. That is the only reason I stay.
YT-Premium is the best answer to this problem so far being completely honest. Being a direct supporter is the most beneficial to the creator (and I do appreciate it!) but does have a poor value proposition to the supporter. YT-premium is, from my experience, something like 5X compared to standard ad revenue per view and gets the user a better viewing experience. It's almost perfect, except that the more popular premium is, the more it lowers the value of ads to the advertisers reducing the other revenue source. So far that doesn't seem to be a problem based the % of YT-Premium users I see on my end though.
And personally as a creator, if you pay for YT-Premium I would absolve you of blocking ads and sponsors to just enjoy the subject material you do actually pay for. I don't do sponsors because I rely so much on direct supporters that I feel like they shouldn't have to deal with that.
As an aside, and with the note it's more the fault of the creators for making slow paced videos (which I am also guilty of), playing back at higher speeds reduces the watch time that is actually the real time spent watching which in turn reduces ad revenue. The system is full of gotchas.
Were it could become dangerous for content creators is when people use it to auto create YT-shorts or TikToks and call it fair use.
* In order not to feel bad about AdBlock and SponsorBlock I got YT-Premium**. I'm a YT-member on two channels and pay nearly 50€ a month with Patreon (Funny enough including your channel.)
** I almost rage quitted YT-Premium because these wankers collect Euros from a UK bank! So 2% foreign exchange charge is added! But many creators say the payout from YT-Premium viewers is more than from ad viewers. That is the only reason I stay.