i don't just assume it is a scam. even something like bisq, the seller has to send their btc to an address out of their control. and trust the people that run it to do the right things...
I don't think the lending platform itself is a scam by any means. But from a quick look it seems to be that you can only lend or borrow various stablecoins or wrapped/tokenized bitcoin. All of these tokens/coins are entirely centralized, in many cases not backed up fully and running fractional reserve, and also there is no guarantees whatsoever that their price is pegged to USD/bitcoin/whatever. So although HodlHodl's platform is perfectly legit, the coins they are supporting are pretty much scams, as far as I am concerned.
maybe that's why. another reason might be paypal reports crypto transactions to the irs or other government taxing authority not sure if they do but i would assume so.
I would work under the assumption that anything you do on a KYCed platform, be that a crypto exchange or fiat service like PayPal, is easily viewable by your government or tax authority should they want.
anyone using something like bisq or agoradesk is not a newbie and they have their reasons. no one just wonders on to a site like that and starts buying bitcoin with paypal. it's either some or all of those things or they are trying to scam.
Or maybe they just want a bit of financial privacy and not to have their bitcoin under the control of third parties. Which was the entire reason bitcoin was created in the first place. I would point out that I have traded on various peer to peer platforms extensively and have never once been scammed. A few misunderstandings which have been fairly easily resolved, sure, but never an active scam.