[Accessibility] choosing and extending tags

[parker, anson D (adp6j)]

Hi all -
I have some friends here in town who are building a website aimed at helping individuals who use wheelchairs find restaurants and other spaces 

they are creating a set of filters for various accessibility features 

see the left hand side of this page for an example

https://staging.bluetrunk.org/businesses/search?keyword=&destinationId=1&limit=5

is there any reason all of these filters can't be added as tags in open street map?  are some of these tags already canonical?  

i can't think of any reason why this entire "site" couldn't just be a series of OSM queries..  then integrate with something like open routing or accessmap.io or .... 

 a  sorry if this is a bit off-topic, it's a nice group of folks and i just want to help them be more impactful... and i feel like if they focused on adding content to OSM and doing advocacy they'd be in a better place?

bit of a rant there, thanks for any thoughts 
anson