I agree with what I think
@User was getting it: it's not a win for society if the charity gets that few quid by portraying straightforward cycling in local media as an extreme sport done only by freaks worthy of funding, is it? At least when my local group goes cycling to raise money, we're doing it in unusual ways like fancy dress or wearing wellies...
Edit: if it's just a straightforward "Jane has never cycled more than 40 miles in a day and is now attempting the 100 which will be a bit of a stretch with some effort over time" that's just about OK, of course, but I'm less keen when it's someone who's done several centuries because that's when charity press teams seem to fall back on "cycling is really really hard so give this freak your money" stories. It's better when the ride gets linked to some other fundraising events like concerts, which I've seen done.