Personally I look at websites this way, if it's ".com", ".org", or ".<country>" it's probably a business or organization, if it's ".io" it's probably a young startup, if it's ".net" it's probably old and not up to date/relevant, and if it's anything else it's either a blog or a scam.
As regards .online, it always strikes me as a bit of a <whatever the opposite of oxymoron is>
Dear John,
You have been invited to the president's birthday, please RSVP by post.
Attached you'll also find a PIN number. It's part of a free gift; true fact! Just use it on any ATM machine.
Best, Tim
PS: could you please bring some chai tea?
OK. I'll play:
1: Please RSVP 2: PIN number 3: Free gift 4: true fact 5: ATM machine 6: Chai tea
PS: PLEONASM sounds like a Spoonerism.