Hi,
since some weeks we have the same issue.
Most probably it started some weeks ago with a link from a facebook account of one of our dance club members to our JEvents calendar (
https://www.tsg-dacapo.de/jeventstestlistbyday-4/). Afterwards we were bothered by a facebook bot with up to 350.000 records per day, which produced up to 80 GB log files. As result, our internet provider IONOS blocked our website because of these heavy loads.
Meanwhile the website is online again and facebook has reduced his accesses, but now we have to observe many other bots. Since these new bots are also looking mainly for /jeventstestlistbyday-4/) we suppose that facebook has sold this address. Now the load went down to less than 80.000 records and log files of lesss than 1 GB. Main pesterer is now Amazon with more than 95%.
We are still working on a solution. Obviously it is not very easy to block Amazonbot. in contrast to bingbot or GPTbot for instance.
If we found a reliable solution we will communicate here. But this is something you can not asked the JEvents team for help. You have to work with the robots.txt and the .htaccess. Ask your providerfor more information. Potentially you have to install even a fire wall.
Best regards
Heinz