I avoid using PayPal internationally because they make it hard for me to pay in foreign currency denominations (they "helpfully" insist on being my exchange) but I have used it, it was no "worse" really than paying domestically. What makes them bad for you for international?

I argue it's not convenient for IRC tipping simply because 1) software is not well-integrated for minimal clicks 2) the other person might not have PayPal.

Don't get me wrong, I don't love PayPal, but I don't think Bitcoin brings anything really fundamentally important & new to the table, except maybe the decentralized part. Though, I suppose you could argue the decentralized nature of email was key for its universal adoption today.

That "helpful" exchange also charges a 3% fee on all currency exchange, on top of their regular fees.

You can insist that they charge you in the same currency as you wish to pay with and your bank will do the exchange at an order of magnitude lower fee. Not everyone knows this. The user interface also doesn't make it very clear (which perhaps surprised no one).

It would be the "not my money" part that is fundamentally different with Paypal. Paypal can choose to withhold this money at any time for any reason, and they have done so in the past. A lot of the money isn't even FDIC insured in the event of bankruptcy etc.

It straight up didn't work with my Vietnamese friend

Have a look at Transferwise.

I transfer money to my mum in the UK once a month from my Australia debit card and its in her account within minutes, and the fees are far lower than a bank transfer.