Are all teabags plastic?
I don’t think all tea bags are plastic.
Most of the cheaper teas are in paper filter bags. Of course this is also tea dust which does not taste as good at the high end stuff but, on the bright side, less plastic.
Best tea is fresh, whole leaf brewed in a glass, glazed pottery or, if you happen to have a your granny's silver set, British silver pot using water that is just off the boil and seeped for no more then four minutes.
Probably the best tasting and healthiest tea.
But in life we rarely get what is best.
They’re talking ‘commercial’ so probably just Industrial Brewed Tea.
Rumor has it that you can make your own tea bags from coffee filters, but that’ll be NEXT week’s Health Scare:
https://letsdrinktea.com/diy-teabags/
OR - just buy loose tea and use a stainless ball brewer to brew a cuppa:
https://www.seriouseats.com/best-tea-infusers-7500581
How about Lipton tea? And Twinings?
So, what is the harm? Plastic is chemically inert