Here is a link to a group that may be offering a global replacement for Backpage and/or the review boards that have shut down in the States. I haven't checked it out beyond looking at the FAQ section and it may only be one of many possibilities but their approach seems good. It probably isn't relevant in Canada where the boards are unaffected and Leolist is replacing Backpage but it could be important for the community in other countries. It uses the TLD for Austria.
https://switter.at/about
https://switter.at/about