You can use them more than once, as long as they aren't saturated and the edges aren't frayed. The advice should be have a few to air and rotate especially if they are not in congregate spaces and environments long enough. Plus, recycle them when they need to be thrown away - no different from the blue surgical masks. We have Wilkinsons here to dispose of them and who recycle them and I have a hospital near me where I dispose/recycle.
I bought a box of 50 from Amazon for £15 and the ones I have used have survived several washes as well. I think for everyday peeps not in a hospital environment with high viral loads it will be fine. Just Drs/ Nurses who have worn them for a 10-12 hour shift they need to only wear them once. But a lot of them are still wearing the blue surgical masks here, which is crazy.
Also, I would say giving them out free is a good start. I doubt all the c.330m Americans will take up the offer (especially the hard core anti mask/anti vaxxers), which may mean tourists etc could get one when over there or Americans can get more than one.
The problem is - at 50 for £15 they're probably fake (and there are thousands of tonnes of fake Chinese knock-offs with fake certificates - as a chiropractor [close contact, low risk patient group, low patient numbers] we're not allowed to use masks with Chinese certification [or we weren't. I that may have been dropped in November]). If an FFP2 masks costs less than £1 each, it's probably fake; they typically cost around £3-£5. You can get genuine ones cheaper, but usually it's someone splitting bulk boxes so they've got the tens of thousands level of discount.
They're no longer FFP2 after 1 single wash.
You CAN get re-usable ones, but they're re-usable as in sessional, so you can wear it all day, but if you're really, really careful, you can hang it around your neck when you have a coffee, and give your face a 10 minute breather/ doing so counts as a re-use.
What you're describing is a false sense of security, and, after it's first wash, no better than a fresh IIR mask (better fit, worse filtration structure) after a few washed, no better than a cloth mask.
You CAN get FFP2-equivalent masks that are (hand) washable, but you'd be lucky to get 1 for £50, and they're not rated as FFP2 BECAUSE they're washable.
ETA: Quick look on Amazon - they're recommended FFP2 masks, at £27 for 60, Product name includes "FFP2/KN95/N95 Face Mask UK" "CE Certified" "Used by Healthcare Professionals"
Hidden in the description is "This product is tested by recognised laboratory and having EU type examination certificate issued by Notified Body."
Reviews such as "Not sure these are the same quality as ones I've bought before they are a lot thinner"
NB, an "EU type examination certificate" isn't an actual EU certificate. "Notified Body" is mysteriously un-named. Based on the Amazon listing for this item, it is a fake FFP2 mask, and that's before washing it.