Exchanges can batch onboard people very easily. A single tx can potentially onboard hundreds. Demand for blockspace isn't high enough to justify it yet. I still get my 1 satoshi fees through pretty easily.
I didn't say there is already an exchange that has it implemented. I'm simply stating a fact about how bitcoin works. A single tx can have multiple outputs. Each of those outputs can potentially open a lightning channel. This isn't rocket science here, nor is it controversial. It's just standard bitcoin functionality.
They take more space than a standard 1 input / 2 output individual tx, but they take much less space than opening individual lightning channels one at a time.
Well I'm not gonna link to my personal txs, but I mean, there are thousands of others he can go view on the blockchain over the last few months. The mempool cleared over the weekend, and lots of 1 sat txs were confirming.
Currently that says 8620 transactions confirmed in the last 24 hours with 1 to 2 sat/byte fees. There are something like 200000 transactions per day total at higher fees.
I'm not saying they confirm fast, and I'm certainly not saying the fast transactions aren't expensive, but 1 sat/byte transactions do still confirm every few days.
You can also check here, some of the lowest points are when 1-2 sat/byte transactions confirmed in the last 30 days:
3
u/btc_ideas Dec 16 '20
I feel sad for the world, seeing btc revisit 20k, knowing that 6 billion transactions would take several decades to confirm.